登入 youtube 後，就能使用訂閱內容、播放清單、購買項目和歷史記錄等功能。 注意： 你必須擁有 google 帳戶，才能登入 youtube。 Get the official youtube app on android phones and tablets. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube.
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Official youtube help center where you can find tips and tutorials on using youtube and other answers to frequently asked questions.
