...an old toothbrush.一把旧牙刷The toothbrush gently removes plaque without damaging the gums.这种牙刷可以温和去除牙菌斑而不损伤齿龈。As soon as the bristles on your toothbrush begin to wear, throw it out.牙刷毛一开始磨损，就把它扔掉。He was short and tubby an...
The only ventilation comes from tiny sliding windows.只能通过小推拉窗来通风。Some people think that ventilation is the same thing as air conditioning.有些人以为通风和空调是一回事.The office has recently been refurbished and the ventilation system...