yì / xiē / yùn / dòng / yuán / zài / sài / jì / wài / jiē / shòu / fēi / xíng / jiǎn / chá / yǐ / què / bǎo / bǐ / sài / gōng / píng

一些运动员在赛季外接受飞行检查，以确保比赛公平。

Some athletes undergo out-of-season drug testing to ensure fair competition.