In addition to timestamping your domain class, you can tap into four event hooks: beforeInsert, befortUpdate, beforeDelete, and onLoad.

除了给域类添加时间戳，还可以引入 4 个事件挂钩：beforeInsert、befortUpdate、beforeDelete 和 onload。

youdao

First, this will be your opportunity to tap the collective wisdom of the class as you prepare your project.

首先，这是你在准备专题时汲取班上集体智慧的机会。

youdao

Bank profits will grow as more Greeks become middle class and tap financial services.

FORBES: Is There Anything Left To Buy?

When it created the Market Vectors Brazil Small Cap back in 2008, it was a way for investors to tap into the burgeoning middle class in Brazil, and was seen as a compliment to the iShares MSCI Brazil ETF.

FORBES: Van Eck Global Makes Case for Russia Small Cap

The logistics sector, a segment of industrial real estate, is also seen as another way to tap into China's growing consumer class.

WSJ: Investors Target Logistics Property in China