suddenly
例子
Suddenly, she remembered where she had left her keys.
突然，她想起了她把钥匙放在哪里了。
The phone rang suddenly, interrupting our conversation.
电话突然响了，打断了我们的谈话。
02
突然, 忽然
quickly and without warning
03
突然, 忽然
on impulse; without premeditation
