n
1 way in and out that can be closed by a gate or gates 大门口
*Don't stand there blocking the gateway! 别站在那儿挡着门口!
2 (usu sing 通常作单数) ~ to sth (fig 比喻)
(a) place through which one must go to reach somewhere else 门径; 关口
*The port of Dover is England's gateway to Europe. 多佛港是英国进入欧洲的大门.
(b) means of gaining sth desired 方法; 手段; 途径
*A good education can be the gateway to success. 良好的教育是通往成功之路.

n
[C]
the opening in a fence, wall etc that can be closed by a gate
gateway to sth
a) a place, especially a city, that you can go through in order to reach another much bigger place
　St. Louis is the gateway to the West.
b) a way of achieving something
　To me a home in the country is a gateway to happiness.
[C]
a way of connecting two computer networks