"Let's get going" 或者 "Let's start" 是表示“出发吧”的常用说法。其中 "get going" 源于 "to begin a journey or an activity"， "start" 源于 "to begin a journey or an activity"。
例句：
Let's get going, we don't want to be late. (让我们出发吧，我们不想迟到。) Let's start this project, we have a lot of work to do. (让我们开始这个项目，我们有很多工作要做。)