backward
副词: backwardly 名词: backwardness
adj.向后的;落后的
adv.向后
例句：用作形容词 (adj.)
He took a backward step and ran away.
他向后退了一步,跑了。
This part of the country is still backward.
这个国家的这个地区仍很落后。
用作副词 (adv.)
He looked backward over his shoulder.
他回头向后看。
He stepped backward and fell over the cliff.
他向后退了一步就从悬崖上掉下去了。