"before you know it" in Chinese (Traditional)
轉眼間一眨眼
Definition
用來表示某事會很快發生，比你想像的還要快。
Usage Notes (Chinese (Traditional))
非正式用語，常用於安慰、承諾或表達事情很快發生。非字面意思，多見於口語，不用於正式寫作。常出現在「很快你就會...」等句型中。
Examples
You'll feel better before you know it.
你**轉眼間**就會覺得好多了。
Summer will be here before you know it.
夏天**轉眼間**就要來了。
The baby will start walking before you know it.
寶寶**很快**就會開始走路了。
Keep practicing and before you know it, you'll master English.
繼續練習，**轉眼間**你就會學好英語了。
Your kids will be grown up before you know it.
孩子們**一眨眼**就會長大了。
Just relax; the waiting will be over before you know it.
放輕鬆；等待很快就會結束。**轉眼間**一切都會過去。