過分謹(jǐn)慎,非真謹(jǐn)慎.The greatest caution is not to be over cautioned.不知進(jìn)退非真勇(不必作無謂的冒險(xiǎn)).There is no point in taking unnecessary risks.因此一樣體積的普通雪糕,因加入大量空氣,其重量比優(yōu)質(zhì)的雪糕必定輕得多,即是[非真材實(shí)料].This is because we do not whip an excess amount of a...