短语讲解：

1. Trains passing through it will be about 2.3 kilometers underground at the deepest point.

pass through 通过; 经过; 经历; 经历并完成
例句：A caterpillar must pass through the cocoon stage to become a butterfly.
毛毛虫必须经过茧的阶段才能变成蝴蝶。

2. When that happens, up to 260 freight trains and 65 passenger trains will be able to pass through it every day.

be able to 能够
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。

3. The tunnel is expected to help the EU railway network -- especially traffic between Germany and Italy.

be expected to 被期待做某事; 有望做某事
例句：I shall be expected to shell out the money for the party.
我将要支付这个集会的费用。

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