更正被推荐答案第二个如下，保证准确率！
1. = I am in/on the swimming team.
= I joined the swimming team.
2. at the age of six
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I am a member of the swimming team
=( I am in the swimming team )
=( I am the swimming team's member )
Children in China start school at 6 years old.=Children in Chinastart school( at the age of 6 )
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