forth /fɔ:θ/ adv. 1. 向前 (多用于书面语)：They ran forth in pursuit of Jack. 他们向前跑追赶杰克。He came forth to receive his degree. 他上前接受他的学位。 2. 用于短语 and (so on and ) so forth 等等(等)：The costumes were red, pink, blue, purple, yellow, and so forth. 戏服有大红的、粉红的、蓝的、紫的、黄的等等。back and forth 来回地，反复地：discuss sth. back and forth 反复讨论某事 The chair is rocking back and forth. 椅子前后摇摆。set forth 1. 提出：He has set forth many important theories. 他提出许多重要理论。 2. 出发： Setting forth on a journey meant a great deal of preparation. 出发旅行意味着要做好大量的准备工作。