It's also very easy to plug in new expression evaluators for things like mvel, ognl, or jruby.

为mvel、ognl或者jruby等增加新的表达式计算插件也是非常容易的。

youdao

Parsing expression grammars (PEGs) are simple to write and easy to maintain.

解析表达式语法（PEGs）编写简单、易于维护。

youdao

Using a regular expression engine, it is easy to test if a string matches the pattern.

通过使用正则表达式引擎，很容易测试出字符串是否与模式匹配。

youdao

"Piece of cake" is another expression that means something is extremely easy to do.

VOA: special.2009.06.07

"As easy as falling off a log" is one such expression.

VOA: special.2009.06.07

Another expression is "as easy as shooting fish in a barrel."

VOA: special.2009.06.07

Pinterest is the first image and interest based social network which has made collection and intent expression extremely easy.

FORBES: D-Commerce And The Pixel Web: The Future Of E-tailing

The task of striking the right balance between privacy and freedom of expression was never going to be easy.

ECONOMIST: Privacy