Remember that the AST classes aren't visible outside of this package at all and that clients will (eventually) simply pass in a String representation of the expression they want evaluated.
要记住AST类在包外是不可见的， 还有就是客户机（最终）只会传入它们想求值的表达式的一个字符串表示。
The pseudo column LEVEL is used in a string to make the hierarchy visible.
可在字符串中使用伪列LEVEL，使分层结构变得可视。
The Label field contains the string that will be visible to the user when the analysis configuration dialog is visible.
Label区域包含了，当分析配置目录可见时，对用户可见的字符串。
The only part of his body that's visible is his wrist, which sports a green string bracelet.
在镜头上所能见到的只是他的手腕部分，手上带着一条绿色手绳。
As they enter a dark room, Turk's green string bracelet is visible.
当他们走进一个暗室时，Turk的绿色手绳清晰显现。
Some versions of string theory portray our visible universe as a three-dimensional space embedded in an invisible space having more dimensions.
一些弦理论将我们可见的宇宙描绘成一个镶嵌于不可见的多维空间内的三维空间。
Some versions of string theory portray our visible universe as a three-dimensional space embedded in an invisible space having more dimensions.
一些弦理论将我们可见的宇宙描绘成一个镶嵌于不可见的多维空间内的三维空间。
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