纸

zhǐ paper; CL:張|张[zhang1],沓[da2]; classifier for documents, letter etc

zhǐ variant of 紙|纸[zhi3]

飞机

fēi jī airplane; CL:架[jia4]

担保

dān bǎo to guarantee; to vouch for

怎么

zěn me how?; what?; why?

zěn me variant of 怎麼|怎么[zen3 me5]

操作

cāo zuò to work; to operate; to manipulate

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