One group had no financial motivation and lost an average of 4 pounds in 16 weeks. The other two groups had financial motivation, and lost three times more weight - an average of about 13-14 pounds.

其中一个小组没有金钱奖励作为诱惑，16周里平均每人减掉了4磅，而其他两个小组有金钱奖励诱惑平均每人减掉了13-14磅，是前面那个小组的三倍多。

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Women who suffered from extreme early morning sickness were three times more likely to give birth prematurely and the baby was nearly three times more likely to be of low weight.

有严重清晨恶心呕吐现象的孕妇有比普通孕妇多三倍的可能性早产，她们的婴儿出现体重过轻现象的可能也增加了近三倍。

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So heavy is demand for the tour, which begins in Sunderland in May, that Britain’s phone network at one point creaked under three to four times the normal weight of calls.

应广大歌迷们的强烈要求接，招合唱团的巡回演唱会将在5月开始，英国的电话网络因此被逼爆了，电话量竟达到了平时的3-4倍。

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For a ship three times the weight of the Titanic, it was fatal.

CNN: Covering a cruise ship disaster

Bristling with sensors, antennas, a laser and a robotic arm, the Curiosity robot, about the size of a small SUV, is twice the length and four times the weight of any of the three prior rovers that explored Mars.

WSJ: Mars Mission Seeks a Happy Landing