其弹性球丸内充满液体，由于液体的相对不可压缩性和表面张力的作用，可促使弹性球丸受力变形后的迅速恢复。
The elastic ball is fully filled with liquid. When the said elastic ball is forced to deform, it can be quickly restored as the liquid has the relative incompressibility and surface tension.
其弹性球丸内充满液体，由于液体的相对不可压缩性和表面张力的作用，可促使弹性球丸受力变形后的迅速恢复。
The elastic ball is fully filled with liquid. When the said elastic ball is forced to deform, it can be quickly restored as the liquid has the relative incompressibility and surface tension.
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