But tourism is double-edged, boosting the economy but damaging the environment.
请问上面句子末尾的目前分词短语作什么成分？若是状语，那它是什么状语？
刘老师和童老师的剖析都有道理，但比较而言，我更倾向于童老师的剖析。
▲刘老师说得对，目前分词用作缘由状语一般是放在句首。如：
Knowing her pretty well, I realized something was wrong. 因为我对她相当知道，我意识到出了事了。
Being anxious to please him, I bought him a nice present. 因为急于讨好他，我给他买了一件精美礼品。
Being a new hand in the work, she didn’t have enough confidence in herself. 因为他做这工作是小白，她对自己没足够的信心。
Realizing that his retirement was near at hand, he looked for some additional income. 意识到自己快要退休了，他想要挣些外快。
Having lost both his parents when he was a child he always felt that the dice were loaded against him. 他因自小失去双亲, 总感觉处处受人欺负。
▲但这只不过通常情况，其达成在分词用作缘由状语时，除是放在句首，也可以放在句中或句末的。如：
The teacher, not having heard the chimes, kept on teaching. 老师没听到下课铃声，仍继续上课。
Many of us, being so excited, could not go to sleep that night. 大家不少人是那样的激动，那天晚上都没睡着。
We couldn’t help them, being so poor ourselves. 大家自己就穷，没法帮助他们。
I didn’t feel terribly shocked, having expected all this. 我并不感到过于震撼，由于这状况我早已料到。
Linda broke off, realizing the importance of what she was about to say. 琳达意识到自己所说内容的重要程度，所以不说了。
