The tier V light tanks are expensive because they are top of their class with excellent performance.

V 阶轻坦需要的经验较多是因为他们是轻坦系列中最高的轻坦，而且拥有非常好的性能。

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The scientists observed that the tetras that normally spend time in the light do sleep soundly at night, resting on the bottom of their tanks.

科学家观察发现，接触阳光时长正常的鱼类在晚上会在鱼缸底部睡得很安稳。

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This gun, with a firing rate of 3,000 rounds per minute, is an effective weapon against vehicles and light armor and can produce a mobility kill on tanks.

这种机炮的射速达到每分钟3，000发，是一种对付车辆及轻型装甲目标的有效武器并且能够对坦克产生一定的杀伤。

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That means no pumps, and allows light, composite materials to be used for its tanks a considerable saving in weight.

ECONOMIST: On a rotor-blade and a prayer | The