1. The main causes of recent delays have been linking two very different railroad systems.
    近来工期拖延的主要原因，是要将两条不同的铁路系统连接起来。

2. The idea of linking England to the European mainland by tunneling beneath the channel goes back to 1802 when an engineer suggested it to Napoleon.
    用海峡隧道将英国和欧洲大陆连接起来的想法最早可以追溯到1802年，当时是一名工程师向拿破仑提出这一建议的。

3. In the sentence " The boy threw the ball " , the word " threw " is a verb.
    在“男孩扔球”这个句子中，“扔”是动词。

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