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1 depend on
2 for example
3 think about
4 come across
5 keep sb from doing sth
6 compare to/with
7 add up to
8 go up
9 result in
10 worry about
11 build up
12 even though/if
13 keep up with
14 encourage sb to do sth
15 in the air
1依靠 2例如 3考虑，思考 4偶然遇见 5阻挡某人作某事 6与……相比 7合计达 8涨价; 上涨 9导致; 引起 10担心 11扩大; 集结 12尽管; 即使 13跟上不; 落后 14鼓励某人做谋事 15不确定;未决定