Semiaperture
半孔径
🗣️ 情景例句
Three things?
三件事？
Affairs that are done by due degrees are soon ended.
事情要安步就班地做，就会很快地做完。
He described it as 'a very agreeable situation located within two small hills in the midst of which flowed a great river.
“地理位置十分适宜，位于两座小山的中间，一条大河从中间流过”。