①光票托收（Clean Collections）。 光票托收，指以汇票、本票、支票而不随附其他单据的托收，故也不涉及交单的方式问题。
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clean n collections 光票托收
All these are called clean collections.
这些都是光票托收。
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The water which was used to carry the wastes to the sewage treatment facility along with rain water collections also undergoes a sanitation process and the clean water is recycled for reuse.
水是用来进行废物，以污水处理设施，随著雨水的收集，也经历了卫生过程和清洁的水是循环再用。
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