water
[名词]
a liquid with no smell, taste, or color, that falls from the sky as rain, and is used for washing, cooking, drinking, etc.

水, 液体
problem
[名词]
something that causes difficulties and is hard to overcome

问题, 难题
Ex: There was problem with the delivery , and the package did n't arrive on time .
hand
[名词]
the part of our body that is at the end of our arm and we use to grab, move, or feel things

手, 手掌
book
[名词]
a set of printed pages that are held together in a cover so that we can turn them and read them

书籍, 书
sea
[名词]
the salt water that covers most of the earth’s surface and surrounds its continents and islands

海, 海洋
family
[名词]
people that are related to each other by blood or marriage, normally made up of a father, mother, and their children

家庭, 家人
system
[名词]
an organized collection of theories, ideas, or a method of attaining a particular objective

体系, 系统

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