可以

can / may / possible / able to / not bad / pretty good

can / may / able to / to approve / to permit / to suit / (particle used for emphasis) certainly / very

used in 可汗[ke4 han2]

old variant of 以[yi3]

old variant of 以[yi3]

abbr. for Israel 以色列[Yi3 se4 lie4]

to use / by means of / according to / in order to / because of / at (a certain date or place)

may not

lit. the other mountain's stone can polish jade (idiom); to improve oneself by accepting criticism from outside / to borrow talent from abroad to develop the nation effectively

can be understood, but not described (idiom, from Zhuangzi 莊子|庄子[Zhuang1 zi3]); mysterious and subtle

a summer insect cannot discuss ice (idiom)

(coll.) very / awfully

a single spark can start a huge blaze (idiom); an insignificant cause can have a massive effect

(coll.) (stative verb suffix) very; awfully