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1·Because of crowdedness, we had to stand outside the classroom.

因为拥挤，我们不得不站在教室外。

2·Concerned Americans are trying to solve the problems of noise, dirt, crime, crowdedness, and pollution in the big cities.

心怀忧虑的美国人正试图解决大城市的噪音、肮脏、犯罪、拥挤和污染问题。

3·To tell the truth, to the old man getting off at this station, I always feel a bit unusual, and different in today, carriage until they leave away, crowdedness further that change, expand happily.

说实话，对于在此站下车的老人来说，我总感觉有些异样，而今天不同，车厢在她们离去后，变的更加的拥挤，幸福在膨胀。