Gum chewing is not allowed in many US school buildings, as it is difficult to clean up.
嚼口香糖是在很多美国学校的建筑里都是不允许的，由于它很难清扫。
It breaks down and causes a mess that is difficult to clean up (requires a carbon cleaner).
它打破了，造成混乱，而且很难说清理(需要一个更清洁的碳)。
Many local farmers said their sheep and cows would die after eating the plastic bags and it was too difficult to clean them up.
许多当地农民表示，他们的牛羊吃了塑料袋后会死去，而且它们很难清理。
They have organized to provide health care for each other, to feed each other, to clean up their space together, to deal with difficult situations using creative solutions.
他们团结一致，在卫生保健、食物和场地打扫上互帮互助，开动脑筋去解决各种困难。
At the same time, the rain is also mixed with some of the naked eye can not see the dust, after the sun, will be derived from a large number of oxides, time to clean up very difficult to clean.
同时，雨水中还夹杂一些肉眼看不到的灰尘，经过阳光照射后，会衍生出大量的氧化物，时间长了想清理干净非常不易。
Don't really have an outstanding player but defensively are one of the best teams in the competition and very difficult to break down kept 7 clean sheets in the lead up to the World Cup.
全队似乎没有特别出众的球星，但是其稳固的后防线却是所有参赛球队中最令人称道、同时也是最不易攻破的。这支队伍还保持着自参加世界杯外围赛至今，7场比赛不失球的骄人纪录。
Don't really have an outstanding player but defensively are one of the best teams in the competition and very difficult to break down kept 7 clean sheets in the lead up to the World Cup.
全队似乎没有特别出众的球星，但是其稳固的后防线却是所有参赛球队中最令人称道、同时也是最不易攻破的。这支队伍还保持着自参加世界杯外围赛至今，7场比赛不失球的骄人纪录。
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