an area of rock that is high above the ground with a very steep side, often at the edge of the sea
悬崖
a usually solid and hard substance that heat and electricity can move through, such as gold, iron, etc.
金属
a solid material forming part of the earth's surface, often made of one or more minerals
岩石
a special kind of picture that is made using a camera in order to make memories, create art, etc.
照片
to put water, coffee, or other type of liquid inside of our body through our mouth
喝点东西
to form, produce, or prepare something, by putting parts together or by combining materials
做某事
a careful and systematic study of a subject to discover new facts or information about it
研究
an official or public statement that contains information about something, particularly a present or future occurrence
公告