We find that when the collapsing bubble approaches its minimum radius, a high pressure layer just outside the bubble is generated which gradually moves outward and subsequently forms a shock wave.

计算还发现，当气泡接近它的最小半径处，气泡外围形成很薄的高压区，这个高压区域随后向外传播，这就形成冲击波。

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But sometimes this hatred broke like a wave, collapsing under its own weight, and before it would begin to well up again she suddenly felt nothing but pure compassion for him, a kindness and forgiveness that almost broke her heart.

NEWYORKER: The Repatriates