semimajor axis of ellipsoid
椭球长半轴，地球长半轴
Either half of the major axis is called a semimajor axis.
长轴的每一半叫做半长轴。
one-half the major axis of an ellipse; the distance from the center of an ellipse to one end.
椭圆长轴的一半；从椭圆的中心到一端的距离。
The major semiaxis a and p of the relative orbital motion are known.
我们知道其相对轨道运动的主要半长轴a和周期p。
Relationships between the minor axis semidiameter and major axis semidiameter have been empirically determined for different structural detail geometries.
对于不同结构细节的几何形状，已经确定了短轴和长轴半径之间的关系。
leading half axle
（拖拉机转弯时）前进半轴
multi-spindle vertical semi-automatic lathe
立式多轴半自动车床
crankcase bottom half
发动机曲轴箱的下半部
reentrant cylindrical cavity
圆柱形凹腔, 半同轴空腔
rear axle differential side gear
后桥差速器半轴齿轮
The camshaft rotates in phase with the crankshaft, but at half its speed.
凸轮轴和曲轴协调旋转, 但速度仅是曲轴的一半。
A vertical Japanese scroll painting.
字轴，画轴，长轴一种垂直（悬挂）的日本卷轴画
To create torque in a long axis stroke( freestyle and backstroke), one must have a semi-fixed point from which to work.
为了在长轴划水（由泳和仰泳）建立扭矩，一个人必须在运动中有一个半稳定点。
Five paces by four and a half.'
五步长四步半宽。”
A short shaft that transmits motion from a motor to a machine, especially in an automobile.
传动轴，驱动半轴从马达传送动作给机器的短轴，尤指汽车
High quality bearing steel is selected to prolong the beering's service life.
轴承选用精制轴承钢，使用寿命长。
Cytyledons and future stalk called the hypocotyl elongate.
子叶和未来称为下胚轴的主轴延长。
Application of Oil-free Lubricating Material to Long Shaft Bearings for Dog Transfer
拨入机长轴轴承无油润滑材料的应用