拉力的方向是这样的。
拉力是一种物体在空气中所受到的阻力，它能产生与球运行方向相反的作用力，减缓球的运行速度，而升力则是一种能使物体偏离直线运行轨迹的力。
Drag is the force of air resistance pushing against a ball's motion and slowing it down, while lift is a force causing a ball to swerve off a straight path.
可如果你有很好的平衡感，你会感觉到一股向着船体的拉力，或者你也许不用感觉就能知道飞船的方向。
But if you have a good balance, you feel a little tugging to the ship, or maybe you just know which way the ship is without feeling it.
但是光的新特性比单纯的推力要高级：光能产生这种更复杂的作用力-提拉力，很显著的例子是一个方向的光通量可以使物体垂直移动。
Light's new trick is fancier than a boring push: It created the more complicated force called lift, evident when a flow in one direction moves an object perpendicularly.
壶铃的运动是前后方向的，而非上下，要实现此目的需要将力向前延伸，并通过双脚抓地来抵抗向前的拉力。
The movement of the bell is forward and back, not up and down, with the goal to project the force forward and to resist by grounding into your feet.
目的：研究髋臼前柱拉力螺钉内固定技术中螺钉的最佳进钉点、方向和长度。
Objective: To study the best entry points, direction and length of screw in acetabular anterior column lag screw technique.
本文讨论了承压型高强度螺栓连接在同时承受剪力和杆轴方向拉力时其计算公式的应用。
This paper discusses the application of calculation formulas of high strength bolt connection in bearing type under the action of both shearing force and axial tensile force.
通过假定刨链的运行方向，确定刨链的最大拉力点，以校核刨链的抗拉强度，得出刨链的安全系数。
Through the assumed moving direction of the plow chain, the maximum pull point is determined, the tensile strength of the plow chain is checked, the safe coefficient of the plow chain is obtained.
用35英镑（156牛顿）的同方向拉力作用于出气冒口的电源线，维持一分钟，从而使电源线的移动行程最大。
A 35 lb (156 N) force was applied for a period of 1 min to the supply cord at the strain relief in a direction to cause the greatest movement of the cord.
它在运行中应能承受导线垂直方向的荷重和水平方向的拉力。
It should be able to withstand the vertical load and horizontal pull of the conductor in operation.
力的分析表明，在粘性介质中存在一对方向相反的阻力和拉力作用于微颗粒。
Force analysis reveals that there are drag and trapping forces imposed on the bead in the opposite directions, respectively, in a viscous medium.
钢板的抗层状撕裂性能采用厚度方向拉力试验的断面收缩率来评定。
The steel plate 'performance in the lamellar tearing resistance aspect can be assessed by reduction in area when doing tension test of through-thickness.
钢板的抗层状撕裂性能采用厚度方向拉力试验的断面收缩率来评定。
The steel plate 'performance in the lamellar tearing resistance aspect can be assessed by reduction in area when doing tension test of through-thickness.
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