I think the serious pollution is one of the c_____ for most

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I think the serious pollution is one of the c_____ for most countries

circumstances 境况
但如果能填词组的话 common problems更好
再问：填cares行么或者crises行么
再答： cares可以 crisises不好，因为这个词是指紧要关头/关乎生死存亡的危机，polution还没到这个份上。而且一般很少见crisises用复数形式的，一般都是a crisis，这样才能显示这“个”危机是生死存亡的

I think the serious pollution is one of the c_____ for most why air pollution is the most serious? 英语翻译POLLUTION IS ONE MOST SERIOUS ______(PROBLEM) IN THE WOR what do you think is the most serious chanllenge of living i What is the most serious pollution in China? For most of us today,the pollution of the environment is mor mark twain is c_____ to be one of the most important writers 英语翻译Today,one of the most serious issues in the word is glob The ______________ is one of the most serious problems in mo the increasing population has become one of the most serious What do you think is the most serious challenge of living in 以what do you think it the most serious challenge of living i