Lecture: lower layer and the cultivated wheat can be mixed only when the layer is loosely packed. However, lower layer is dense and they cannot be mixed. Moreover the upper layer contains diverse particles, but there is nothing in the lower layer.
2. Author: trade
Lecture: only southern Europe can cultivate wheat. ~~ so they cannot trade each other.
3. Author: earlier Britain farmers
Lecture: researchers surveyed powdery pollen of diverse species and they cannot find pollen of wheat in the layer.
1번에 diverse species인 것같은데 잘 못들어서 그냥 particles로 의역했거든요... detail 감점당할까요?ㅜ
2번 3번은 어떤가요??