By this time, however, three men had come into the ring and they quickly dragged the drunk to safety.
然而,此时已有3个人进入斗牛场,迅速把醉汉拉到安全的地方。
So it is necessary to analyze the mechanics behaviour of the locomotive wheel added the retaining ring, so that we can supply the theory proof to the safety usage of the locomotive.
因此,必须对加装扣环后机车轮对的力学行为进行研究,为保证铁路机车运行安全提供理论依据。
To predict helicopter vortex ring state boundary is necessary for flight safety.
直升机涡环状态边界的确定对直升机飞行安全具有重要意义。
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