拿印度和孟加拉国作比较。
印度和孟加拉国的河道系统布满肠道致病菌。
The river systems of India and Bangladesh are rife with diarrhoeal disease.
梅林达盖茨说，目前的工作是把一种新的药物带到印度和孟加拉国称以对抗黑热。
Melinda Gates says there is work now to bring a new drug to India and Bangladesh to fight what is known as black fever.
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