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医生建议我多做运动来锻炼背部肌肉。

The doctor advised me to do more exercise to strengthen my ___back muscles.

我背疼，所以去看了医生。

I have a sore ___back, so I went to see a doctor.

游泳对背部健康很有好处。

Swimming is very good for your ___back health.

这些运动员的背部都很强壮。

These athletes have very strong ___backs.