hollow基本解释
adj,空的；中空的，空腹的；凹的；虚伪的,同近
Hollow out the cake and fill it with cream..在蛋糕上挖个洞，填入奶油。
凿空，挖空英释vvto make a hole or empty space by removing the inside part of something
hollow fiber,中空纤维.短语
