- 重点词汇
- 无偿
free; gratuitous; unpaid; voluntary; unwaged; gratuitously; gratis; voluntarily; for free; for love; just for love; just for the love of; for the love of
- 使用
use; employ; apply; take; operate; put; manage; handle; utilize; wield; call on; deal in; put to use; make use of; call into play; go with; avail oneself of; manipulate; occupy; utilise; access; touch; exercise; stretch; ply; work; disinter; usage; service; application; employment; consumption; commitment; occupancy; occupation; assertion; uptake; disposal; management; with; on; by means of; through the use of
- 证明
prove; demonstrate; justify; evidence; certify; attest; confirm; corroborate; substantiate; validate; bear witness; testify; bear out; proof; proving; testimony; certification; identification; certificate; testament; attestation; demonstration; verification; cert.; evidential; confirmatory; testimonial
- 怎么
how; why; what; what about; how about