It either expands the elements on disk to include added fields, or, if the fields don't exist in the class definition it is working with in the given JVM, it ignores them.

它或者扩展磁盘上的元素以包括添加的字段，或者，如果给定jvm中使用的类定义中不存在这些字段，则忽略它们。

youdao

I have looked at three specific tools in this class (but others probably exist).

我已查看过本课程中的三种特定工具(但也可能有其它工具存在)。

youdao

All that needs to happen for this code to kick in is for a property to exist in the target class whose display name exactly matches the name of the property in the Exif tags.

这个代码需要添加的就是在目标类中存在一个属性，它的显示名将准确匹配Exif标记中的属性的名称。

youdao

Most American intellectuals and U.S. politicians are hoping Americans will get used to permanently-higher government spending as a share of GDP, and eventually, higher tax burdens, if even on the middle class (as exist in the dysfunctional European welfare states).

FORBES: The Lopsided Fiscal Cliff Deal: All Tax Hikes, No Spending Restraint

Finally, a strong middle class can only exist in an economy where everyone plays by the same rules, from Wall Street to Main Street. (Applause.) As infuriating as it was for all of us, we rescued our major banks from collapse, not only because a full-blown financial meltdown would have sent us into a second Depression, but because we need a strong, healthy financial sector in this country.

WHITEHOUSE: President Obama Speaks on the Economy

Many providers rely on a blended learning approach, where in-class and online learning exist together, complementing one another.

FORBES: Technology's Continuing Struggle to Disrupt Higher Ed