第四句：
在旅途中，自助旅游者经常能够发现一些新的美丽景点，但有时也会遇见意想不到的困难或突发事件。
译文一
During their trips, self-guided travelers can often discover new scenic spots, but sometimes they may encounter unexpected difficulties or emergencies.
思路：本句有两个短句，可处理为 but 连接的并列句。
译文二
On their journeys, self-guided tourists frequently discover fresh charming attractions, but occasionally encounter unforeseen troubles and sudden incidents.
译文三
While traveling, individual travelers often spot brand-new lovely sights, though they might come across unexpected hardships and sudden events.
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