而且使拥挤不堪
And it makes it extremely crowded
以上为机器翻译结果，长、整句建议使用 人工翻译 。
汽车不仅污染城市空气，而且使城市拥挤不堪。
They not only pollute the air in cities, but make them crowed.
youdao
汽车不仅污染城市空气，而且使城市变得拥挤不堪。
They not only pollute the air in cities, but make then crowded.
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