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About 10 years ago, I followed some researchers waist deep into the waters of the Everglades. In the middle of the night. We kept a vigilant¹ eye out for alligators² and for venomous snakes. But the animals that actually posed the greatest danger were mosquitoes. Which were transmitting encephalitis that season.

I’m telling that story because August 20th is World Mosquito Day. (party horn sound) Actually, it’s not a day to celebrate. More like an awareness³ day. Ronald Ross of the Liverpool School of Tropical Medicine originated World Mosquito Day in 1897. He’s the guy who figured out that mosquitoes carried the malaria⁴ parasite⁵. He got one of the first Nobel Prizes for it in 1902.

But mosquitoes and the diseases they carry remain huge problems. Malaria alone kills more than a million people every year, mostly kids. Anybody can help in the fight by making sure there’s no standing⁶ water around, where mosquitoes love to breed.

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1 vigilant
adj.警觉的，警戒的，警惕的
参考例句：
He has to learn how to remain vigilant through these long nights.他得学会如何在这漫长的黑夜里保持警觉。 The dog kept a vigilant guard over the house.这只狗警醒地守护着这所房屋。

2 alligators
n.短吻鳄( alligator的名词复数 )
参考例句：
Two alligators rest their snouts on the water's surface. 两只鳄鱼的大嘴栖息在水面上。来自辞典例句 In the movement of logs by water the lumber industry was greatly helped by alligators. 木材工业过去在水上运输木料时所十分倚重的就是鳄鱼。来自辞典例句

3 awareness
n.意识，觉悟，懂事，明智
参考例句：
There is a general awareness that smoking is harmful.人们普遍认识到吸烟有害健康。 Environmental awareness has increased over the years.这些年来人们的环境意识增强了。

4 malaria
n.疟疾
参考例句：
He had frequent attacks of malaria.他常患疟疾。 Malaria is a kind of serious malady.疟疾是一种严重的疾病。

5 parasite
n.寄生虫；寄生菌；食客
参考例句：
The lazy man was a parasite on his family.那懒汉是家里的寄生虫。 I don't want to be a parasite.I must earn my own way in life.我不想做寄生虫，我要自己养活自己。

6 standing
n.持续，地位；adj.永久的，不动的，直立的，不流动的
参考例句：
After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。 They're standing out against any change in the law.他们坚决反对对法律做任何修改。