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(jiǎn)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。