Kids who don't know how to swim should wearlife jackets.
不会游泳的孩子应该穿救生衣。
2
They're used primarily for on-off service and provide excellent wearlife and 100% positive shutoff of abrasive slurries.
他们主要用于开关功能，同时提供卓越的磨损寿命，对浆液实现100%的完全关断。
3
The conclusions drew in the paper will provide useful reference when the marine engineers make decision, also build up a strong basis for the research on wearlife of the cylinder.