1.當說到保護環境的重要性時,
1. When it comes to the importance of protecting the environment
2.當說到為什麼要保護野生動物時,
2. When it comes to (the reason ) why we should protect the wildlife
3.當說到我沒有參加會議的原因時,
3. When it comes to (the reason ) why I didn’t attend the meeting
4.當說到我是怎樣花自己的零花錢的時候,
4. When it comes to (the way ) how I spent my pocket money
5. 當說到我在這個問題上的觀點的時候,
5. When it comes to my opinion on this question,
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