vt.竞争，匹敌 (compete, match)
Edison is a genius who can't be rivaled by ordinary mortals though advancedly educated.
n.冲突，竞争 (squabble, conflict)
In France, going on strike is frequently being utilised by the union in fighting for the workers' interest, which strikes the nation's economy heavily.
The human being struggles with his environment.
vt.逗惹，使…着急 (provoke, tease)
Every time I reached for the bird, it disappeared. I withdrew, it reappeared. It posed a tantalizing question for me.
The salesman thumped the door knocker.
vt.转换 (change, transform)
I converted the spare bedroom into a reading room.
That factory has diversified its products.
vt.丰富(make rich, enhance)
I enriched my coffee with cream and sugar.
The weather in this area is fickle; you can never foretell.