hurdle

他在跨栏比赛中碰倒了第三个栏架

He knocked over the third ___hurdle during the race.

他在跨栏比赛中轻松跃过了所有障碍。

He cleared every ___hurdle easily in the track race.

学习新语言时，最大的障碍是克服内心的恐惧。

The biggest ___hurdle in learning a new language is overcoming your inner fear.