- 上下: and -- one of the six catego ...
- 游隙: play; end play; backlash
- 上下游厂商: up-and down-stream vendors
- 船闸上下游水位差: lock lift
- 下游: 1.(河流下游) lower reaches; downstream; after-bay; tail water2.(落后的地位) backward position 甘居下游 be resigned to being backward; 这孩子的学习成绩属下游。 the child is backward in his studies
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