按 + Noun / Standard + Verb
按 (àn) used as a preposition means "according to," "in accordance with," or "by." It introduces a standard, rule, or basis for an action. It is interchangeable with 按照 in many contexts, though 按 is slightly more concise.
按公司规定,员工每天必须打卡。
àn gōngsī guīdìng, yuángōng měitiān bìxū dǎkǎ.
According to company rules, employees must clock in every day.
请按顺序排队,不要插队。
qǐng àn shùnxù páiduì, bùyào chāduì.
Please line up in order and don't cut in line.
我们按计划下周一出发。
wǒmen àn jìhuà xià zhōuyī chūfā.
We'll depart next Monday as planned.