You can listen to trước đó on this page in both Northern and Southern Vietnamese accents.
How is trước đó used in a sentence?
For example: Trước đó, tôi chưa từng gặp anh ấy. (Previously, I had never seen him.); Chúng tôi đã chuẩn bị kỹ trước đó. (We had prepared in advance.).
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