forth

Compared meaning: moving forward (adverb).

比较义项：向前、继续前进（副词）。

• forth 本词

  Mostly confined to fixed phrases like "back and forth" or "and so forth"; rarely used alone as a productive adverb, and sounds archaic or literary outside those set expressions.

  主要出现在back and forth（来来回回）、and so forth（等等）等固定短语中；很少单独作为能产的副词使用，脱离这些固定搭配会显得古旧、书面化。

  The children ran back and forth across the playground.

  孩子们在操场上跑来跑去。

• onward

  The everyday, productive word for continuing forward, especially from a point in time, as in "from that day onward"; using "forth" in such contexts would sound old-fashioned.

  是日常、能产的用词，尤指从某个时间点起持续向前推进，常见于“from...onward”结构；在这种语境下换成forth会显得陈旧过时。

  From that day onward, she jogged every morning before work.

  从那天起，她每天上班前都会去跑步。

Forth and onward both mean moving forward. But forth is mostly used in fixed phrases like back and forth or and so forth; alone, it sounds old and literary. Onward is the common, everyday word, especially in phrases like from that day onward.

这两个词在“向前”这一意义上相近，但用法差别明显：forth几乎只出现在back and forth、and so forth等固定短语里，单独使用表示“向前”时显得古旧、书面化；onward则是日常、能产的用词，尤其常见于from...onward结构，表示从某个时间点起持续向前。