You ordered enough for three or four people,but I'm not complaining.
你叫了够三到四个人吃的菜,但我毫不在意。
Let us talk about it at our leisure.
那件事我们有空再谈吧。
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.