water-tightness

例句：

1. 1. The new carhas a water-tightness thatmakes it very reliable.
   这辆新车的密封性非常好，非常可靠。
2. 2. The boat's hull is designed tobe water-tightness, soit can withstand strong waves.
   这艘船的船身设计得非常防水，可以承受强烈的海浪。
3. 3. The new door hasa water-tightness that keepsout insects and moisture.
   新门的防水性能很好，可以防止昆虫和湿气进入。