问题描述：
英语翻译
1.voluteering brings them feelings of self-fulfillment and the knowledge that they have made a difference.
2..Sometimes,you are (giving) to people you don’t know .这里为什么用give的ing形式
1.voluteering brings them feelings of self-fulfillment and the knowledge that they have made a difference.
2..Sometimes,you are (giving) to people you don’t know .这里为什么用give的ing形式
问题解答：
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