The custodian have to see him darting behind and forth in the darkness.
看守人看见他在黑暗中奔来跑去。
example：Someone was pacing back and forth behind the curtain.
有人在幕布后踱来踱去.
We are now forth in the championship and 15 points behind the leaders.
我现在处于积分榜的第四位，落后榜首15分。
Someone was pacing back and forth behind the curtain.
有人正在幕布后踱来踱去。
Someone was pacing back and forth behind the curtain.
有人正在幕布后踱来踱去。
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