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。)

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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。

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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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Researchers at Wake Forest University recently developed a new type of light bulb that uses field-induced polymer electroluminescent technology to create a soft white, full spectrum light that could last a decade.

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