Prediction of D iseases from Satellite I nformation gotten by satellites Recently m eningitis has been spreading across West Africa. It is a threat every year in across 21 African countries. Now, (no comma) scientists find they can predict and prepare for this disease or other diseases.
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Li HangBut why you change across 21 African countries to in 21 African countries? I want to express a sense of the motion of the diseases.Recently meningitis has been spreading across West Africa. It is a threat every year in 21 African countries.