provided

当表示事实相符的真实语气时，意为只要，that不可省略；当表示与事实相反的虚拟语气时，意为假如、假设，that可以省略；作为固定搭配时，意为规定。

例句We shall go provided that the weather is fine.只要天晴, 我们就去。A Web application is provided that allows the operating system service to be easily invoked. 它提供了一个Web应用程序，使操作系统服务易于调用。I will agree to go provided that ( providing that) my expenses are paid.如果帮我支付费用，我就同意去。