1348年的黑死病是由森林树木下腐殖质的逐渐丧失引起的。

The Black Death of 1348 was caused by gradual loss of the humus fertility found under forest trees.

youdao

1348年的黑死病是由森林树木下腐殖质的逐渐丧失引起的。

The Black Death of 1348 was caused by gradual loss of the humus fertility found under forest trees.

youdao