die of
die from
die from 间接原因
In big cities during cold winter months,many old people die from the polluted air.
在大城市里,在寒冷的冬季,许多老年人死于污染的空气.（空气污染导致疾病.）
die of 直接原因
Throw that silly ice bag away before you die of pneumonia.
快把那个没用的冰袋摔掉,要不你会得肺炎死掉的.
die of
die from
die from 间接原因
In big cities during cold winter months,many old people die from the polluted air.
在大城市里,在寒冷的冬季,许多老年人死于污染的空气.（空气污染导致疾病.）
die of 直接原因
Throw that silly ice bag away before you die of pneumonia.
快把那个没用的冰袋摔掉,要不你会得肺炎死掉的.