Scientific problems
[计] 科学问题
🧩 词语组成解析
n. 问题；难题（problem的复数）
🗣️ 情景例句
There is an emergency. Please send a fire engine.
这有火灾，请尽快派消防车来。
It's a busy street.
这是一个繁忙的街道。
I find listening really hard. Sometimes it's just impossible to understand.
我觉得听力很难。有时简直听不懂。