...the apparently unbridgeable gulf between the SIS and the Security Service...秘密情报局和国家安全局之间显然难以逾越的鸿沟The spill could wipe out the Gulf's turtle population...这次原油泄漏可能会使波斯湾的海龟灭绝。...the US-made Patriot anti-missile sys...
这是平行四边形的对边.These are the opposite sides of the parallelogram.这种作图法常被称为矢量相加的平行四边形法则.This construction is often called the parallelogram law of addition of vectors.梯形是具有两平行边的四边形.A trapezoid is a quadrilateral with two para...