That tells you whichever eye you'll look through, that mean you're left-eyed or right-eyed.
这就说明了你更习惯于用左眼还是用右眼。
The methods have become sophisticated though so it often takes a sharp-eyed referee to make the right call.
现在很多球员对于这一招术的运用非常老到，因此就需要裁判员敏锐的观察力来作出正确的判罚。
And although he is an optimist, Mr Kelly has a clear-eyed view of the drawbacks of technology and the difficulty of striking the right balance, at both a personal and societal level, in its adoption.
虽然他比较乐观，但是他清楚地了解科技的缺陷，明白不管是个人抑或是社会在利用科技上做出正确的平衡都是有难度的。
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