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大門口；門道；入口
A gateway is an entrance where there is a gate.
例句
He walked across the park and through a gateway.
他穿過公園，走過一道大門。
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（通往更廣闊地方的）通道，門戶
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.
里昂是從英國驅車前往阿爾卑斯山的門戶。
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（取得進展或更大成功的）途徑，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.
在競爭異常激烈的模特界，這一享有盛譽的頭銜打開了通往成功的大門。
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網關；網間連接設備
In computing, a gateway connects different computer networks so that information can be passed between them.