1 tangible adj.可触摸的,可见的 --- intangible 
e.g. tangible assets 有形资产 
Sculpture is a tangible art form.雕塑是一种可见的艺术形式。 

2 .collapse v&n 倒塌,崩溃 
e.g. The economy of the country is on the verge of collapse. 
该国的经济就要崩溃了. 
The building collapsed during the air raid. 
这座建筑物在空袭中倒塌了. 
He went home after the hard work for a whole day, collapsed. 
一天的辛劳之后,他回到家里筋疲力尽. 

　3. boost v. 促进,提升 
e.g. The vacation during the May Day has greatly boosted domestic economy. 
五一假期极大的拉动了国内经济增长. 
These changes will help to boost the share prices. 
这些变化将有助于提高股票价格. 
Internet boosts the involvement of parents into the study of their children.