这个计算器可以对通过键盘或GUI按钮输入的表达式进行计算。

The calculator evaluates expressions typed in from either the keyboard or the GUI buttons.

youdao

希瑟：用这些按钮输入你要的影印本数目，然后按那绿色的大钮开始影印。

Heather: Enter the number of copies you want using these buttons and then press the big green button to start.

youdao

一旦用户通过小键盘上的四个按钮输入正确的个人身份证号码，缺损的数字才会显现出来，这样才能看到完整的卡号；而且这时信用卡的磁条也会被填入数据，磁条锁定便被解开可以在网上或者商店购物。

Once the correct PIN is entered on the card's four buttons, the missing digits are filled in and the card's magnetic strip is populated with data.

youdao

And you can write your source code in it but to compile something you don't run a command like GCC and then the name of the file, you instead click a button.

你们可以在上面写源代码,如果要编译的话，不用像GCC这样要输入命令，文件名,只需点击按钮就可以了。

哈佛公开课 - 计算机科学课程节选