1.account for 占……比例

Coursework accounts for 40% of the final marks.

课程作业占最后总成绩的40%bI)V0eFT3J。

2.for proof 要论证据

For proof, see Clint Eastwood's Gran Torino.

要论证据，克林特·伊斯特伍德主演的《老爷车》就是证据5R^q17P6b5mBZT,_oe。

3.by hand 手工

Rice farmers here still plant and harvest their crops by hand.

这里的稻农仍然用手工种植和收割庄稼ppte1CsFcv6[AWW~X#。

4.form the backbone of 构成了……的支柱

These laboratories, which are located in more than 80 countries, form the backbone of the global influenza surveillance programme.

这些实验室分设在80多个国家，构成了全球流感监测规划的中坚力量@-A6wgYu94I+s*。