书籍 Total English - 基础 - 第 12 单元 - 第 1 课

any of the large land masses of the earth surrounded by sea such as Europe, Africa or Asia

an obstacle that separates people or hinders any progress or communication

a passage dug through or under a mountain or a structure, typically for cars, trains, people, etc.

to join two or more things together

a piece of land surrounded by water

to be connected or linked together

to establish a physical connection or attachment between two or more things

the main part of a continent or country that is connected to a larger landmass, excluding surrounding islands or territories