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大门口；门道；入口
A gateway is an entrance where there is a gate.
例句
He walked across the park and through a gateway.
他穿过公园，走过一道大门。
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（通往更广阔地方的）通道，门户
A gateway to somewhere is a place which you go through because it leads you to a much larger place.
例句
Lyons is the gateway to the Alps for motorists driving out from Britain.
里昂是从英国驱车前往阿尔卑斯山的门户。
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（取得进展或更大成功的）途径，手段
If something is a gateway to a job, career, or other activity, it gives you the opportunity to make progress or get further success in that activity.
例句
The prestigious title offered a gateway to success in the highly competitive world of modelling.
在竞争异常激烈的模特界，这一享有盛誉的头衔打开了通往成功的大门。
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网关；网间连接设备
In computing, a gateway connects different computer networks so that information can be passed between them.