hollow metal door
... hollow concrete 多孔混凝土 hollow metal door 包铁门 hollow wall 空心墙 ...
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包马口铁皮的门 tin clad door tin-clad door
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第二天黄昏，年轻的艺人又像往常一样准时来到地铁门口，和以往不同的是，他还从包里拿出一张大纸，然后很认真地铺在地上， 四周还用自备的小石块压上。
The next day, the young artist came to the gate of the subway station, Different than the day before, he took out a large piece of paper and laid it on the ground and put some stones on it.
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