第 1 周：定义输入/输出标准与红线
The engines fired and Apollo 8 slid silently behind the Moon. The men heard a crackle in their headsets as the radio signal to Mission Control faltered and then failed.
，详情可参考safew官方下载
Credit: Amy Sussman/Getty Images
Кадр: Telegram-канал МВД Медиа
[[ anyRcv isNil ifTrue: anyBlock ] -> [ anyRcv ifNil: anyBlock ]] brewrite preview