还要注意的是，与左栏中的每个符号相对应的是右栏中同一颜色的一个小方框。
Also notice that corresponding to each symbol in the left column is a small box in the same color in the right column.
因为没有导入Vector类型，所以左侧空白上将有一个符号，是一个包含“X”和黄色电灯泡的红色方框。(参见图4。)
Since you haven't imported the Vector type, there will be a symbol in the left margin, a red box with an "x" combined with a yellow light bulb, as shown in Figure 4.
如果没有将打印机的字体更新为包括欧元符号，则将打印方框来代替欧元符号。
If fonts for your printer are not updated to include the Euro, a box will be printed instead of the Euro symbol.
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