Only then did I realize the importance of English.
Only when a child grows up does he understand his parents' intentions.
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參考答案:1、仅在那时我才明白英语的重要性。
I realized the importance of English only then.
2、只有当孩子长大的时候他才明白父母的良苦用心。
A child understands his parents' intentions only when he grows up.