- 第一: first; primary; foremost; fi ...
- 单元: unit; unit element; cell; lo ...
- 公约: convention; treaty; pact
- 第一单元: ne general rules of writing chinese and english official documents; the first unit= unit one; unit one command; unit one complaint; unit one form of bid; unit one letters of invitation; unit one pacts; unit one summary
- 第一单元 总结: unit one summary
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