运动后记得喝水来补充水分。

After exercise, remember to ___hydrate by drinking water.

记得在户外活动时多喝水保持水分。

Remember to ___hydrate frequently when you're outdoors.

在进行这个实验前，你需要先用水将粉末水合。

Before conducting this experiment, you need to ___hydrate the powder with water first.