If you want to, you can enter an expression for a value.
如果愿意，您可以输入表达式作为值。
You'll learn more about these expressions later. For now, enter an expression that refers to the user ID in the current row of the outer table, as described in the following steps.
稍后您将会学到更多关于这些表达式的信息。
If you enter an invalid expression, the text turns red.
如果您输入一个无效的表达式，其文本将变为红色。
When you type an expression after the >in the interactions window and hit Enter, DrRacket evaluates the expression and prints its result.
在交互窗口敲入一个表达式，回车，DrRacket就会执行这个表达式，然后打印出结果。
The next time you invite a friend over, pretend to be reading an encyclopedia as they enter the door and look at their expression.
等你下次邀请朋友来做客，他们进门的时候你就假装正在看百科全书，看看他们的表情。
Enter a literal value or an expression.
可输入文本值或表达式。
Article 14An offer is an expression of an intent to enter into a contract with another person. Such expression of intent shall comply with the following:(1)its contents shall be specific and definite;
第十四条要约是希望和他人订立合同的意思表示，该意思表示应当符合下列规定：（一）内容具体确定；
Article 14An offer is an expression of an intent to enter into a contract with another person. Such expression of intent shall comply with the following:(1)its contents shall be specific and definite;
第十四条要约是希望和他人订立合同的意思表示，该意思表示应当符合下列规定：（一）内容具体确定；
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