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1、
After piston reaches BDC , or the lower limit of its travel, it begins to move upward.
在活塞到达下止点时, 或者是活塞下限时, 活塞开始向上运动.
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- avail ofv.利用;
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- corrupt way of life穷奢极欲;
- at the word of command一声令下;一听到命令声
- be utterly devoid of conscience丧尽天良;
- breach of faith违约，违背诺言（尤指不履行婚约）;
- avail oneself of利用;乘;趁;假;
- audit of financial statements财务报表审计;
- type of writing语体；文体;
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- at this time of year在（一年的）这个时节里;
- lateral column of spinal cord脊髓侧柱
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