In 2013, David made use of his after work time to renew the bicycle by using bamboo as the main frame. He found out that this kind of bicycles are more light, but also stronger and tougher.

2013年，王大卫利用下班时间，花了半年的功夫，摸索着用竹子为主骨架制作了一台自行车，这样的自行车轻便结实，给了他很大的启发与灵感。

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Two weeks ago, Conservative leader David Cameron called for tougher sentences for rapists, saying too many men "think they can get away with it".

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Sir David's book is tougher and much harder edged, with far more attention paid not merely to military matters but to the diplomatic and strategic context in which Frederick the Great operated.

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As David reported, some House Republicans are urging a much tougher approach to illegal immigrants.

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