十万个为什么·科学启蒙30篇（3）
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The Moon Slides in Front of the Sun
月亮滑到太阳前面，就发生日食
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A solar eclipse happens when the Moon passes exactly between Earth and the Sun.日食发生时，月球恰好位于地球和太阳之间。
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Its shadow then falls on part of Earth’s surface for a few minutes.月球的影子随即在地球表面投下，持续几分钟。
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This only works because the Moon and Sun appear almost the same size in our sky.这之所以可行，是因为月球和太阳在我们天空中看起来大小几乎相同。
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Even though the Sun is much bigger, it’s also much farther away from us.尽管太阳大得多，但它离我们也远得多。
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When the Moon covers the Sun completely, daylight turns into twilight suddenly.当月球完全遮住太阳时，白昼会突然变成暮色。
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Birds may stop singing, and temperatures drop by several degrees quickly.鸟儿可能停止鸣叫，气温也会迅速下降好几度。
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You must never look directly at the Sun during an eclipse without special glasses.日食期间，切勿在没有专用眼镜的情况下直视太阳。
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Partial eclipses show just a bite taken out of the Sun’s bright circle.偏食只显示太阳明亮圆盘上被‘咬掉’一小块。
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People in different cities see different amounts of coverage depending on location.不同城市的人因所处位置不同，看到的遮挡程度也不同。
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Next year, a total eclipse will cross parts of Mexico, the U.S., and Canada.明年，一次日全食将横跨墨西哥、美国和加拿大的部分地区。