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
I did both with Richard and Susan,
有Richard和Susan时我这样做，
A sense of regret or resentment will not help us in any way.
后悔和怨恨不会给我们任何帮助。
I don't know. My head hurts.
不知道。我头痛。