A hurdle is a problem, difficulty, or part of a process that may prevent you from achieving something.
例句
Two-thirds of candidates fail at this first hurdle and are packed off home...三分之二的候選人在第一個難關就敗下陣來，只好打包回家了。The weather will be the biggest hurdle so I have to be ready.天氣將會是最大的障礙，所以我必須要作好準備。
N-COUNT-COLL
跨欄賽跑;障礙賽跑
Hurdles is a race in which people have to jump over a number of obstacles that are also called hurdles. You can use hurdles to refer to one or more races.
例句
Davis won the 400m. hurdles in a new Olympic time of 49.3 sec.戴維斯以49.3秒的成績刷新奧運會紀錄，在400米跨欄賽跑中一舉奪冠。
VERB
（在跑步過程中）跳躍，跨越
If you hurdle, you jump over something while you are running.
例句
He crossed the lawn and hurdled the short fence...他跑過草地，跳過低矮的柵欄。She learnt to hurdle by leaping over bales of hay on her family's farm.她通過在自家農場里跳跨干草捆學會了跨欄。
英漢詞典釋義
n.
跳欄, 欄架
With her speed and agility, Cage cut out all her competitors in the hurdle race.凱奇跨欄時速度快, 動作敏捷, 擊敗了其他所有選手。
障礙； 困難；難關
In starting a new company, many hurdles must be crossed.剛開辦一個公司時, 必須克服許多障礙。
vi.
進行跨欄賽; 越過障礙
The runner hurdled the fence.跑步者越過籬笆。
英英詞典釋義
Noun
1. a light movable barrier that competitors must leap over in certain races