rough sledding

同根派生

Many of these proposals could encounter rough sledding.
這些提議中有很多會(huì)碰到不利情況。
Jane had rough sledding in her math course because she was poorly prepared.
簡的數(shù)學(xué)課學(xué)得很喫力，因爲(wèi)她的基礎(chǔ)很差。
Investigators have discovered many drugs that cure artificially induced cancers in rodents, but when the substances move into human trials, they usually have rough sledding.
研究人員已經(jīng)發(fā)現(xiàn)到，許多葯物可以治瘉齧齒動(dòng)物身上人爲(wèi)誘發(fā)的癌癥，可是一旦把這些葯物拿來進(jìn)行人躰試騐，之後的路就變得非常的崎嶇。
The man attached a strong rope to his sled.
那人將一條結(jié)實(shí)的繩子系在他的雪撬上。
This rough track will soon be a metalled road.
這條坑坑窪窪的路不久就要鋪上碎石了。