The way to learn a language is to practice speaking it as often as possible.
学习一门语言的方法就是要尽量多地操练说出它来。
The law is not the same at morning and at night.
早上的法令跟晚上的不一样;朝令夕改。
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.