本文提出一种确定实际极限载荷的零曲率准则。
A zero-curvature criterion is proposed to determine the practical collapse load.
一个不稳定的直排四缸引擎的实际排量极限大约在2.4升。
The practical limit for an unbalanced inline-four is around 2.4 litres.
“这种背景下，自然中的速度极限就不一定是光速，”他说，“而实际上可能是中微子的速度。”
"With this kind of background, it is not necessarily the case that the limiting speed in nature is the speed of light," he said.
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