命令用法如下：

sudo apt-get install package=version
例如我要安装autoconf 2.50：

sudo apt-get install autoconf=2.50

　　近日，我国在黄海海域用长征十一号海射运载火箭，采取“一箭九星”方式将“吉林一号”高分 03-1 组卫星送入预定轨道，发射获得圆满成功。

　　这次任务也是长征系列运载火箭的第 346 次发射。

　　据了解，此次卫星发射任务，由太原卫星发射中心具体组织实施。长征十一号海射运载火箭承担发射任务，该火箭是航天科技集团有限公司研制生产。

　　而“吉林一号”高分 03-1 组卫星由长光卫星技术有限公司研制，其中还包括有“哔哩哔哩视频卫星”、“‘央视频号’卫星”在内的 3 颗视频成像模式卫星和 6 颗推扫成像模式卫星。

　　主要用于获取高分辨率可见光推扫影像和视频影像，将为我国国土资源普查、城市规划、灾害监测等提供遥感服务。

　　而此次，随着吉林一号的入轨，B站的这颗“视频卫星”也成功升空。据B站此前介绍，今后还将在卫星拍摄的海量遥感视频、图片数据基础上定期更新科普视频。

　　内容将包含科技、人文、历史、地球、公益、教育等多个领域，并为B站用户定制拍摄任务，用卫星航拍美丽地球。

Baidu’s company PopIn has launched Dubox, an online storage product for foreign users. Registration can get 1TB of free capacity and unlimited upload and download speeds.

Dubox does not seem to have a speed limit, and the measured download speed can reach 33MB/s.

However, the service is only for overseas users, and IP access from mainland China is prohibited. The access will show that the current area is not available.

HMD Global 宣布将于 9 月 22 日下午 4 点 (北京时间晚上 23 点)举行在线发布会，发给媒体的邀请函显示，将公布多款诺基亚新手机，但该公司还没有明确提到这些产品的名称。

HMD宣布9月22日召开发布会，诺基亚7.3/9.3 PureView有望发布

有传言称，HMD Global 将在下半年公布诺基亚 7.3 和诺基亚 9.3 PureView，而这些新机很可能在 9 月 22 日正式发布。该公司还可能发布传闻中的诺基亚 3.4 和诺基亚 2.4 经济型智能手机。

HMD宣布9月22日召开发布会，诺基亚7.3/9.3 PureView有望发布

此前消息称，至少有四款诺基亚智能手机正在研发中，分别是诺基亚 9.3 PureView、诺基亚 7.3、诺基亚 3.4 和诺基亚 2.4。后两者被认为会在高端机型之前推出。

据传，诺基亚 9.3 PureView 是备受期待的诺基亚 9 PureView 的后续产品。HMD Global 尚未在 2020 年推出旗舰手机，因此 9 月 22 日可能会看到诺基亚 9.3 正式发布。不过，爆料者 Nokia Anew 称诺基亚 9.3 还没有准备好，不会在 9 月 22 日推出，该爆料者称诺基亚 7.3 将在本月发布。

IT之家了解到，诺基亚 7.3 很有可能会在 9 月 22 日发布，因为该小道消息人士指出，诺基亚 7.2 已经停产，目前诺基亚 7.2 在诺基亚印度官方网站上显示 “缺货”。

In an interview with the media on the emergency use of the new crown inactivated vaccine and overseas phase III clinical research, the head of Sinopharm China Biotechnology revealed that the two new crown inactivated vaccines developed by Sinopharm China Bio have been vaccinated for hundreds of thousands of times, and none of them is obviously bad. In response, no one was infected; among them, tens of thousands of people who went to overseas high-risk countries and regions after the vaccine had no infection so far.

　　 Zhou Song, the general counsel of Sinopharm China Biotechnology, said that three domestic new crown inactivated vaccines have been approved for clinical trials, and Sinopharm China Biotechnology accounts for two of them. It is currently the largest emergency vaccination and the largest number of people. Zhou Song emphasized that the more important thing is that the emergency use of the new crown inactivated vaccine is aimed at people with high risk exposures, such as medical staff who treat people infected with the new crown virus, as well as diplomats and foreigners going to high-risk countries. Dispatch employees and Chinese-funded enterprises "Belt and Road" construction personnel and so on. These tens of thousands of people have been overseas for a few months after being vaccinated. Among them, in the areas where the epidemic broke out, some left-behind employees were infected but they did not. Parallel control data like this is available in multiple countries, which proves the effectiveness of the vaccine.

　　, Zhang Yuntao, vice president of Sinopharm China Biology, said that phase I and II clinical studies of the new crown inactivated vaccine were carried out in China, and neutralizing antibodies were produced. "Neutralizing antibody testing is the gold standard." In overseas Phase III clinical studies, neutralizing antibodies will also be continuously observed. Neutralizing antibodies are comparable. Overseas trials have expanded races, countries, and populations, and most importantly, they have been recognized overseas, which will be better for future applications.

　　 Zhang Yuntao said that in the past, it was difficult for our vaccines to be exported. There were a series of regulations and clinical restrictions. Now that our scientific and technological strength is strong, the data of phase I and II clinical trials are recognized overseas, and the direct development of phase III clinical research overseas is a model of international cooperation. In the future, if China's approval is passed, as long as these countries do clinical research, they can also be legally listed on the market. He revealed that at present, there are 500 million doses of intentional orders for the new crown inactivated vaccine in the world.