求翻译：他们根据自己的兴趣和爱好，每周花几个小时的时间参加不同的志愿工作。simon到小学帮助小学生阅读 ，andy到动物医院照料动物，amy到医院给病人演唱歌曲。这些都是很有意义的活动。是什么意思？

Them according to their interests and hobbies, spend hours of time each week to participate in a variety of voluntary work. Simon to help primary school pupils ' reading in primary schools, Andy to the animal hospital animal care, Amy to sing songs to the patient at the hospital. These are very significant activities.