share、equity、stock、interest在用作“股票、股份、权益”时如何区分?

stock是股票（证劵）的统称.
I own stocks.（我拥有股票）
I have ten stocks in my portfolio.（我的投资组合内有十只股票）
Microsoft's stock hits a recent high.（微软的股票达到近来的高位）
share是一股股票,每一股有一个投票权
I own a share of Microsoft.（我拥有一股微软）
I own two hundred shares of Microsoft.（我有二百股微软）
I own two hundred shares of Microsoft's stock.（我有二百股微软的股票）
Some stocks are divided into A,B,and C shares.（有些股票分为A/B/C股）
equity 是资产
The president owns 50% of the shares.The president has a large equity in the company.
interest是利息,股份,股权(+in)
I borrowed the money at 5% interest.
我以五分利息借了那笔钱.
He has an interest in the company.
他在这家公司拥有股份.