Word: 定理 (dìnglǐ) 定理 dictionary entry dìnglǐ theorem Full dictionary entry for 定理 Example sentences using 定理 2 sentences, showing page 1 of 1. 他花了好几年才证明了这条定理。 Tā huāle hǎojǐnián cái zhèngmíng le zhè tiáo dìnglǐ. It took him several years to prove this theorem. 你能用这个定理解开这道题吗？ Nǐ néng yòng zhège dìnglǐ jiěkāi zhè dào tí ma? Can you solve this problem using this theorem?