在我14歲的時候，我曾到美國遊學，當時我去到了洛杉磯、舊金山以及拉斯維

在我14歲的時候，我曾到美國遊學，當時我去到了洛杉磯、舊金山以及拉斯維加斯。

Results (English) 1:

When I was 14 years old, I went to the United States to study, when I went to Los Angeles, San Francisco and Las Vegas.

Results (English) 2:

When I was 14 years old, I went to the United States to study. At that time, I went to Los Angeles, San Francisco and Las Vegas.

Results (English) 3:

When I was 14 years old, I studied in the United States, and I went to Los Angeles, San Francisco and Las Vegas at that time.