Grammar Note
注意英式拼写 tunnelled / tunnelling，美式拼写 tunneled / tunneling。
挖隧道；掘进
tunneled — past of tunnel
先理解核心含义，再看它在真实句子里的用法。
挖隧道；掘进
to dig a tunnel through or under something; to move through by digging
The workers tunnelled through the hill to build a new road.
工人们挖隧道穿过小山，以便修建一条新公路。
挖掘隧道
To make a tunnel through or under something; to burrow.
挖掘隧道
To dig a tunnel.
通过隧道传输(用于不安全或不支持的协议)
To transmit something through a tunnel (wrapper for an insecure or unsupported protocol).
通过挖掘移动
move through by or as by digging
tunnel
Base
原形
tunnels
3rd person
第三人称单数
tunnelling
-ing
现在分词
tunnelled
Past
过去式
tunnelled
Past participle
过去分词
Moles tunnel underground.
鼹鼠在地下挖洞。
The prisoners tunnelled under the wall and escaped.
囚犯们在墙下挖了地道逃走了。
They have tunnelled through the mountain.
他们已经挖通了这座山。
规则动词；英式拼写在 -ing 和 -ed 时双写 l（美式亦可作 tunneling/tunneled）。
Rabbits often tunnel under the fence to get into the garden.
兔子经常在栅栏下面挖通道，溜进花园里。
Engineers are tunnelling under the river to lay the new metro line.
工程师们正在河底挖掘隧道，铺设新的地铁线路。
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注意英式拼写 tunnelled / tunnelling，美式拼写 tunneled / tunneling。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.