400 miles per pair of shoes is a good rule of thumb, but you should track the mileage on each pair of shoes and find a number that works for you.
每400英里换一双是一个很好的经验法则，但你应该记录每双鞋所跑过的里程，以选一双最适合你的鞋。
Company A currently produces and sells tennis shoes at the unit price $60 per pair.
公司A是一家生产并销售网球鞋的企业。其网球鞋现在的出售单价是60美元。
Company A currently produces and sells tennis shoes at the unit price $60 per pair.
公司A是一家生产并销售网球鞋的企业。其网球鞋现在的出售单价是60美元。
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