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

Tom is a noisy boy and always talked in class. oneday, the teacher said to him: If you speak again, I will tap you!

汤姆是一个淘气的男孩，总是上课说话。一天老师对他说，如果你再说话，我就把你的嘴粘起来。

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