retrosternal thyroid

例句：

1. 1. The thyroid gland is responsible for producing hormones that regulate metabolism.
   甲状腺腺体负责产生调节新陈代谢的激素。
2. 2.The patient's thyroid function was normal, but she needed to take medication regularly.
   患者的甲状腺功能正常，但需要定期服药。
3. 3.Thyroid problems can lead to fatigue and weight gain, so it's important to monitor thyroid levels.
   甲状腺问题可能导致疲劳和体重增加，因此监测甲状腺水平很重要。