Firstly, as the annotations are in the aspects, not core business logic, the cost of switching isn't high.

首先，因为注解存在于切面中，而不是核心业务逻辑，所以转换的成本并不高。

youdao

youdao

youdao

He says many,if not all, of the top American colleges once had a core curriculum a set of courses required for all students.

VOA: special.2009.10.22

At the core of it is a belief in progress, something that was essentially not present among the Greeks.

其核心就是对于进步的信仰,实质上说这在希腊文化中是不存在的

耶鲁公开课 - 古希腊历史简介课程节选

The core electrons tend not to be involved in much chemistry in bonding or in reactions.

核电子倾向于不参与结合,或者反应。

麻省理工公开课 - 化学原理课程节选

They often come up with great inventions that are not core to the company.

FORBES: Connect

We have overhauled risk management and reduced risk exposures, while shedding assets and businesses that are not core to our strategy.

FORBES: Citi: $730M Settlement Ends Claims It Misled Investors Over Bonds, Stock

While there are synergies in building out a display business and a coupon business, these are not core strengths of Google.

FORBES: Google-Groupon: Price Too High?