•The train went into the tunnel.火车驶入隧道。

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•The decision has not yet been made whether to tunnel under the river or build a bridge over it.还没有决定是在河底挖掘隧道还是在河上建桥。

•The alternative is to tunnel a route through the mountain.另一个办法是挖一条穿山隧道。

•He was trapped in a collapsed building but managed to tunnel his way out.他被困在倒塌的楼房下，但他想办法挖地道出来了。