而且也相当危险
And it is also quite dangerous
以上为机器翻译结果，长、整句建议使用 人工翻译 。
早期自行车的前轮比后轮大很多，而且车座也很高，使得骑车人很难控制车子。这种情况是相当危险的。
Originally, the front wheel was much larger than the rear wheel, and the rider was elevated a great deal, making them difficult to control and very dangerous.
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