1. Their motives remain a mystery.

2. We must remain impartial.

3. You can remain anonymous if you wish.

4. These feelings of rejection and hurt remain.

5. The ship will remain outside Chinese territorial waters.

6. The editor's decision is final and shall evermore remain so.

7. They remain resolutely opposed to the idea.

8. Train fares are likely to remain unchanged.

9. Dealers said investors remain bearish.

10. Only a few trees remain after the storm.

这些句子涵盖了"remain"在不同语境下的用法，包括表示“保持”、“剩余”、“停留”等含义。希望这些例子能帮助你更好地理解这个词的用法。