F-number
n. 数, 光圈数
🧩 词语组成解析
🗣️ 情景例句
Being with him helped.
和他在一起有帮助。
Which American singer do you like to listen to?
你喜欢哪个美国歌星的歌曲？
A radio message from the mainland had been received by the ship's captain instructing him to give up the search.
返航前，该船船长收到了大陆发来的电报，指示他们放弃这次搜寻。