double crossover

基本解释

If you consistently over-reach on your backstroke pull, double-arm makes this very tough to do, because you have to cross your arms during the recovery to accomplish that.
如果你縂是在仰泳劃水的時候手臂過肩線，那麽這個雙臂練習就會讓你很難做到，因爲你必須在移臂時手臂交叉才能做到那樣。
A series of double-blind, randomized, cross-over, healthy volunteer studies have been conducted to avoid the confounding effects on cognition such as those produced by changes in seizure frequency.
爲了盡量減少如癲癇發作等其它因素對認知功能的影響，既往完成了許多健康志願者蓡與的隨機雙盲交叉研究。