Fermeture
[军]后膛关闭装置
🗣️ 情景例句
When can I photograph a class?
我何时才来上课呢？
He has been to America.
他曾去过美国。[表示曾经有过的经验]
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。