Happened
v. 发生（happen的过去式, 过去分词）
🗣️ 情景例句
you had some doubts about wanting to go to Michigan.
你对上Michigan大学有些疑虑。
Caution is the parent of safety.
谨慎小心是安全之源。
CUSTOMS OFFICER: Are you tourists?
你们是来旅游的吗？