backward

Compared meaning: toward the back, in the opposite direction (adverb).

比较义项：向后地，朝相反方向（副词）。

• backward 本词

  More typical in American English as the adverb of direction; unlike backwards, it can also function as an adjective before a noun (a backward glance) — that use is not compared here.

  作方向副词时在美式英语中更常用；与 backwards 不同，它还能作形容词修饰名词（如 a backward glance，此处不作比较）。

  He took a step backward when the dog barked loudly.

  狗大声叫的时候，他向后退了一步。

• backwards

  More typical in British and other Commonwealth English as the adverb of direction; it only works as an adverb, never as an adjective before a noun.

  作方向副词时在英式及其他英联邦英语中更常用；它只能作副词，不能像 backward 一样作形容词修饰名词。

  He accidentally put his shirt on backwards this morning.

  他今天早上不小心把衬衫穿反了。

Backward and backwards both mean toward the back or opposite direction, and are almost interchangeable. The difference is regional: backward is common in American English, and backwards is common in British English. Backward can work as an adjective, as in 'a backward glance', not compared.

这两个词在“向后、朝相反方向”这个副词义项上几乎可以互换，主要区别在于地域用法习惯：backward 在美式英语中更常见，backwards 在英式及其他英联邦英语中更常见；此外 backward 还能作形容词修饰名词（如 a backward glance，此处不作比较），backwards 没有这种形容词用法。

Compared meaning: opposite or turned the other way (adjective).

比较义项：相反的、颠倒的（形容词）。

• reverse

  Reverse is the neutral, general-purpose word for something facing or ordered the opposite way (reverse order, reverse gear); it also doubles as a common verb.

  reverse是最中性、最通用的词，指方向或顺序上相反（如reverse order表示顺序颠倒、reverse gear表示倒挡）；它也常用作动词。

  Try reading the sentence in reverse order, starting from the last word.

  试着按相反的顺序读这句话，从最后一个词开始读。

• backward 本词

  Backward describes physical movement or orientation toward the back, the opposite way one is facing or going; it is concrete and not used for abstract statements or arguments.

  backward描述身体上朝后的移动或朝向，即与面对或前进方向相反的一侧；它是具体的动作方向词，不用于描述抽象的陈述或论点。

  She gave a backward glance at the empty house before driving off.

  她开车离开前，朝那栋空房子回头看了一眼。

• converse

  Converse is a formal word for a statement, argument or situation that is exactly reversed, often seen in logic as 'the converse of a proposition'; it is not used for physical direction.

  converse是较正式的词，用来描述完全颠倒的陈述、论点或情形，常见于逆命题等逻辑表达；它不用于表示身体上的方向。

  In geometry, the converse of a true statement is not always true.

  在几何学中，一个真命题的逆命题并不一定成立。

Reverse, backward, and converse all mean opposite, but differ. Reverse is the neutral word for the opposite way. Backward means physical direction toward the back. Converse is formal, for a statement exactly reversed. Converse can mean 'to talk', and backward can mean underdeveloped; not compared.

这三个词在这个意义上都表示“相反的”，但语气和使用场合不同：reverse最通用中性，backward偏重身体动作或方位上朝后，converse则多用于正式场合，描述完全颠倒的情形或命题。这里不比较converse表示“交谈”的动词义（如与朋友交谈），也不比较backward表示“发展迟缓、落后的”这一义项。