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.
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。)
Because you haven't imported the Vector type, there will be a vaguely familiar symbol in the left margin, a red box with an "x" combined with a yellow light bulb.
因为您尚未导入vector类，这时在左边框中就会出现一个似曾相识的符号，即一个带叉“X”的红框，再加上一个黄色的灯泡。
It USES 90% less power than an old-type bulb and has an average life of 25,000 hours.
它比老式灯泡少消耗90%的电力，而且平均寿命达到25000小时。
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