Angina pectoris, a type of chest pain, is a feeling of constriction around the heart or pain that may radiate to the left arm or shoulder, usually brought on by exertion.

单项选择题Myopia can be the result of anabnormallythick eyeball or the distortion of the lens of the eye.

单项选择题Yet,in light ofher findings about the influences of cellphones, she advises users to keep their cellphones at a distance by putting them on speaker mode or using a wired headset whenever possible.