in an emergency: when a problem suddenly comes

• 在紧急时

in an emergency: when a problem suddenly comes的用法和样例：

例句

1. He always keeps calm in an emergency.
   他总是在紧急时保持镇静的。
2. I like to keep some money in a savings account to fall back on in an emergency.
   我想在活期存单中存一些钱，以便在紧急时有个依靠。