I doubled up with laughter when I heard the punch line.
当我听到那句双关语时，捧腹大笑得直不起腰来。
That time when we caught Molly I doubled up with laughter.
我们抓住莫莉那一回，我笑得直不起腰来。
Someone struck him hard in the stomach; the pain doubled him up.
有人猛击了他的腹部，他痛得弯下了身子。
Someone struck him hard in the stomach; the pain doubled him up with pain.
有人猛击了他的胃，他痛得直不起身来。
It can speed up the system doubled and redoubled.
该算法可以成倍提高系统的处理速度。
It can speed up the system doubled and redoubled.
该算法可以成倍提高系统的处理速度。
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