He advised farmers to choose the best seed-heads, the ones that had the best colour.
他劝告农民要挑选最好的谷穗，也就是那些颜色最好的谷穗。
2
To overcome this, Borlaug worked on breeding wheat with shorter and stronger stalks, which could hold on larger seedheads.
为了克服这个问题，博洛格致力于培育具有更短更强壮茎干的小麦，这样的小麦可以拥有更大的种子头。
3
Their seedheads raised just high enough above the ground to catch the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water content.