The kinematically admissible velocity field for the indentation of semi infinite medium by a round flat punch has been established.
建立了圆冲头压入半无限体的运动许可速度场；
He knocked me flat with one punch.
他一拳把我打倒。
But do not use cold water spilled punch, don't put gas, it could lead to a flat tire on the early damage and the tires.
但切忌用冷水泼冲，更不要放气，否则会导致途中爆胎和轮胎的早期损坏。
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