hygro

例句：

1. 1. The room is too dry;we need more hygro to keep it moist.
   房间太干燥了，我们需要更多的湿度来保持它的湿润。
2. 2. The plant needs a certain level of humidity to grow well.
   这种植物需要一定的湿度才能生长良好。
3. 3. The air was so humid that it felt like walking through a sponge.
   空气非常潮湿，感觉就像走在海绵上一样。