The gem cannot be polished without friction, nor man perfected without trials.
?? 名句詞匯解析
從本句名言中提取的重要詞匯，幫助你深度理解這句話
n. 摩擦;沖突，不和;摩擦力;
?? frica, frict 表”摩擦”
"the coefficient of friction"
摩擦系數(shù)
近義：massage, rub, scour, scrub, swab, swob
polished
['p?li?t]
adj. 磨光的，擦亮的;完美的，精良的;優(yōu)雅的;
v. 使光滑，擦亮(polish的過去式和過去分詞);
"The boxer polished off his opponent in the first round."
那個拳擊手在第一個回合就把他的對手擊倒了.
近義：sleek, burnished, glace, waxed, frosted, ground
反義：abrasive, asperous, rough, tart, coarse
=can not;未可;不能;不可;
"You cannot stay here ad infinitum without paying rent."
你不付房租就不能永遠(yuǎn)住在這里。