波音“星际客机”载人试飞再次推迟
当地时间5月14日，波音公司表示，由于发现氦气泄漏问题，将再次推迟“星际客机”飞船的首次载人飞行到下周。“星际客机”飞船首次载人试飞原定当地时间5月6日夜间展开，因运载该飞船的“宇宙神5”型火箭出现阀门故障取消。在对发射数据进行彻底检查后，研制火箭的美国联合发射联盟公司替换了火箭上部液氧舱的一个压力控制阀门。波音公司在一份声明中说，团队“测试了新阀门，其性能正常”，不过新发现的氦气泄漏问题尚未解决。
—— 央视新闻、华盛顿邮报
BY 风向旗参考快讯
Launched in 2013, Telegram allows users to broadcast messages to a following via “channels”, or create public and private groups that are simple for others to access. Users can also send and receive large data files, including text and zip files, directly via the app.The platform said it has more than 500m active users, and topped 1bn downloads in August, according to data from SensorTower.
Some messages aren’t supposed to last forever. There are some Telegram groups and conversations where it’s best if messages are automatically deleted in a day or a week. Here’s how to auto-delete messages in any Telegram chat. You can enable the auto-delete feature on a per-chat basis. It works for both one-on-one conversations and group chats. Previously, you needed to use the Secret Chat feature to automatically delete messages after a set time. At the time of writing, you can choose to automatically delete messages after a day or a week. Telegram starts the timer once they are sent, not after they are read. This won’t affect the messages that were sent before enabling the feature.
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