was the impact of colonialism itself

如我所说是殖民主义本身
on the inhabitants of the tropical world;

对热带居民的影响
that is, there was no attention to the way in which colonialism itself

人们从未注意过殖民主义
contributed to environmental degradation;

成为环境退化的一个原因
or promoted labor mobility in unsanitary conditions;

它引起劳动力在不卫生的条件下流动
the way in which it promoted unplanned urbanization,

它促进了毫无计划的城市化
low educational attainment and poverty.

低教育水平以及贫困
In fact, this period,

在此期间
the first period of tropical medicine,

热带医学的第一个时期
from 1890 to just after the First World War,

从1890年到第一次世界大战之后
was a time, one of the times,

有一段时间一个时代
of the greatest epidemiological disasters in the tropical world,

在热带世界形成了最严重的流行病灾害