Motors on the milling machines are totally enclosed to guard against ingress of metallic dust.
铣床上的电动机都是全封闭的，以防止金属粉尘进入。
2
Believe it or not, the training for work as a security guard let me avoid a small decoration in the house. When it was decorating, lots of poison dust and smell went into my room during my absent.
信不信由你，保安培训期间，我避开了住处的一次小装修，也就避开了那些装修产生的有害灰尘和气体。
3
Whenever she was searched, she made sure some of the dust and dirt got on the guard women's faces. This made them sneeze and cough.