提示：点击例句中的单词，就可以看到词义解释

It reddens the hills now .

现在它染红了群山。

Where the peach reddens to the south .

南方转红的桃子。

At lower concentrations gypsum acts as an irritant ; it reddens the eyes , inflames the throat , and causes nausea , shortness of breath , and fluid in the lungs .

低浓度的硫化氢是一种刺激物，会让眼睛变红，喉咙发痒，反胃恶心，呼吸急促，肺部不畅。