1、The new coffee mug is designed to be leakproof, so you don't have to worry about spills.
这个新的咖啡杯设计成防渗漏的，所以你不必担心洒出来的问题。
2、The contractor assured us that the roof is completely leakproof, even during heavy rains.
承包商保证我们屋顶完全防渗漏，即使在大雨天也是如此。