Swimming is an excellent cross-training activity for running because it's not weight-bearing, so it gives your joints (which take a lot of stress when you're running) a break.

游泳是非常棒的一种交叉训练方式。 因为它不需要承重，能让关节（在跑步的时候可是给承受了很大的压力啊）休息。

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CROSS-CONTROLLING – incorrect weight-shift technique that cancels effect of pilots control inputs.

交叉控制–运用不正确的重心移动技术会抵消飞行员操控输入的效果。

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Radial loading is the amount of weight placed vertically above the axle. Sitting on a trike places an axial load on the bearings. The drawing below is a cross-sectional view of a radial bearing.

径向负荷的重量是多少轴垂直放在上面。三轮车坐在一个地方对轴承的轴向负荷。下图是一个径向轴承截面的看法。

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The problem is that while there are lots of observational or cross sectional studies on soda and weight gain, there are very few studies which, by their design, can show cause and effect.

FORBES: ABC News Attacks Scientist Who Exposed Bias In Obesity Research

In addition, its economy has collapsed under the weight of hyperinflation and its health care system is in a shambles, forcing some Zimbabweans to cross the border into South Africa for treatment.

CNN: Mugabe 'needs to go,' U.S. says

Clinton Newtown added more evidence to the difference in size and weight between the team's when he fell off a tackle on Whitehead only to see him cross the line four minutes later.

BBC: Bradford 40-4 Hull KR