1. He has a sinus infection and needs to take antibiotics.
他得了鼻窦炎，需要服用抗生素。

2. The graph of the function is a sinusoidal curve.
这个函数的图像是一个正弦曲线。

3. The doctor suspects that the pain in his abdomen is due to a sinus problem.
医生怀疑他腹部的疼痛是由于胰周问题引起的。