坦克停了下来，长长的炮管转过来瞄准了山脊。The tank stopped with the long snout of its gun turned to the ridge.火焰温度较低, 因而可使炮管寿命较长.The flame temperature is lower, thus giving a longer barrel life.二战时期的重型火炮的炮管,也是这么工作的.The heavy gun barrels of W...
The number of signers of the petition for a new school snowballed.要求增设新学校而签名的人像滚雪球似的越来越多.The court rejected their petition.法庭驳回了他们的上诉。They began to petition the queen.他们开始企求女王....
结论爪鲵在两栖纲动物中属于较原始的种类.Conclusion Onychodactylus fischeri is a relatively primitive type in the amphibian.白颌大角蟾及其相关物种的分类探讨 ( 两栖纲: 锄足蟾科 )TAXONOMIC DISCUSSION OF MEGOPHRYS LATERALLS ( ANDERSON ) AND RELATED SPECIES ( AMPHIBIA...