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vi.先前存在
vt.先于……存在
1、preexisting───先存
2、preexist───vi.先前存在;vt.先于…存在
1、numerical simulation of the experiment on rock with preexisted cracks under compression is presented by using a rock failure process analysis code, RFPA2D.───采用岩石破裂过程分析软件RFPA2D对预制裂隙大理岩试样的压剪试验进行数值模拟。
1、The proposed backoff algorithm could be executed on the top of the preexisted IEEE 802.11 protocol, and it is represented by its simplicity, integrability, complete distribution and adaptiveness.