空军专家说这架战机，也就是J20似乎在做高速滑行实验，这通常是试飞前的最后一个步骤。
Military aviation experts said the fighter? Known as the J-20? Appeared to be conducting high-speed taxi tests, which are usually the final stage before a test flight.
这两条实验性道路是计划的12条高速公路中的第一批，目的是使高速公路更快、更安全，让伦敦市民骑自行车上班更加方便。
The two pilot routes are the first of 12 planned superhighways that aim to make it quicker, safer and easier for Londoners to commute to work by bicycle.
一个证明相对质量改变的好实验，可以通过在高速运动的粒子上观察到。
A good demonstration of the relativistic change of mass can be observed experimentally on very fast-moving particles.
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