And they are expected to become the leading cause of death in many African nations by twenty-twenty .

同时他们预计到 2020 年， 慢性 病 也将成为许多非洲国家 人口死亡的主要原因。

I am a twenty-twenty student But many of classmates are near-sighted .

我班的许多同学都 得了近视， 可我的 视力却 很 正常。

By twenty-twenty chemical production is expected to increase by forty percent in Africa and the Middle East and thirty-three percent in Latin America .

在 2020 年，预计化学品生产会在非洲和中东增加40%，在拉丁美洲增加33%。