竭尽全力jié jìn quán lì
to spare no effort (idiom)端正duān zhèng
upright, regular, proper, correct笨拙bèn zhuō
clumsy, awkward, stupid粗鲁cū lǔ
crude, coarse, rough精华jīng huá
best feature, most important part of an object精益求精jīng yì qiú jīng
to perfect sth that is already outstanding (idiom)精确jīng què
accurate, precise精简jīng jiǎn
to simplify, to reduce