Optical shutter
[计] 光闸
🧩 词语组成解析
🗣️ 情景例句
His number is 555-8842.
他的电话是555-8842。
He received full credit for his studies at a previous school.
他在一所先前的学校取得了所有课程的学分。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。