irregular ⇒ 这些人行为不轨引起了警察的注意。 Zhèxiē rén xíngwéi bùguǐ yǐnqǐle jǐngchá de zhùyì. → The irregular conduct of these people has attracted the attention of the police.

normal practice

merge ⇒ 两种体制并轨。 Liǎng zhǒng tǐzhì bìngguǐ. → The two systems have merged.

be brought into line with

right track

derail

overstep the mark

( 数 ) locus

( 指机车 ) track

be in transition

be on the right track