Springback is a kind of common phenomenon that is hard to solve in the stamping.
回弹是板料冲压成形过程中一种常见但很难解决的现象.
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Note: 1 your college admission notice can buy price tickets, but only hard seat.
注: 1)用你的高校录取通知书可以买到半价的车票, 但只限于硬座.
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There are four classes on the train: soft berth, sleeper soft seat, hard seat.
火车分为软卧 、 硬卧、软座 、 硬座四个级别.
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