be caused by的用法和样例：
例句
- Roughness of the skin can be caused by bad diet.
饮食不好可能引起皮肤粗糙。 - The doctor told him that his disease was caused by unbalanced hormone.
医生告诉他他的病是由荷尔蒙失衡引起的。 - Heart attacks and strokes can be caused by many reasons.
许多原因可引起心脏病和中风。 - An abnormal sensitivity to or intolerance of light, especially by the eyes, as may be caused by eye inflammation, lack of pigmentation in the iris, or various diseases.
畏光，羞明对光线不正常敏感或无法忍受，尤指由眼引起的，可能是由眼炎、眼球虹彩中缺少色素或其它疾病而引起的
