名词
1. 预防措施；防备
A precaution is an action that is intended to prevent something dangerous or unpleasant from happening.
1. a precautionary measure warding off impending danger or damage or injury etc.
e.g. he put an ice pack on the injury as a precaution
an insurance policy is a good safeguard
we let our guard down
2. the trait of practicing caution in advance
3. judiciousness in avoiding harm or danger
e.g. he exercised caution in opening the door
he handled the vase with care
Synonym: cautioncareforethought