rough sledding

同根派生

Many of these proposals could encounter rough sledding.
這些提議中有很多會碰到不利情況。
Jane had rough sledding in her math course because she was poorly prepared.
簡的數(shù)學課學得很吃力，因為她的基礎很差。
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，許多藥物可以治愈齧齒動物身上人為誘發(fā)的癌癥，可是一旦把這些藥物拿來進行人體試驗，之后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)實的繩子系在他的雪撬上。
This rough track will soon be a metalled road.
這條坑坑洼洼的路不久就要鋪上碎石了。