牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。When not removed, plaque causes tooth decay and gum disease.牙龈萎缩可能是疾病导致的，也可能仅仅是错误的刷牙方式引起的。Receding gums can be the result of disease or simply incorrect brushing.我牙龈脓肿，所以他就把那颗牙拔掉了。I got an abscess so...
灯光正照着他的眼睛,他什么也看不清.The light was shining in his eyes and he could not see.房子在薄雾中隐隐约约看不清.The houses appeared as a blur in the mist.在越来越暗的情况下,什么东西都看不清.In the gathering gloom it was difficult to see anything distinctly....