Arachnids have four pairs of legs but only two body parts.

蜘蛛纲动物有四对腿还有两个身体部分.

英语晨读30分（高一）

Spiders have four pairs of legs but only two body parts.

蜘蛛有四对腿还有两个身体部分.

英语晨读30分（高一）

Lampholders plane circular ring by equidistant cloth tiger for the two - body pack.

灯座平面圆形,下由等距环布的双身虎承驮.

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In the two - body case, the approximate equations of relative motion on elliptic orbits are derived.

在二体假设下, 推导了椭圆轨道上相对运动方程的近似形式.

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The global minima of Rgn - N 2 O ( n > 2 ) are found using powell method , with two - body potential model.

首次确定了Rg_n-N_2O ( n>2 ) 的构型.

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