I was travelling at the time and have only just got back and had a chance to post a shot and tell you how I took it.
那时我刚旅行回来，所以有机会拍这张照片并且告诉你拍摄方法。
It was only by chance that I found you here.
我也是碰巧在这儿见到你的。
It was only by chance that I looked down and found the keys you lost.
我只是无意中往下一看，才发现你丢失的钥匙的。
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