Normally, during pregnancy, the spiral arteries dilate to 5-10 times their normal size and develop into large uteroplacental arteries capable of delivering large quantities of blood to the developing fetus.

正常妊娠中，子宫螺旋动脉可以扩张至原先直径的5-10倍，并发育成粗大的子宫胎盘动脉，从而向发育中的胎儿输送大量血液。

The grower's price I understand to be the same with what is sometimes called the contract price, or the price at which a farmer contracts for a certain number of years to deliver a certain quantity of corn to a dealer.

我理解的种植者价格与有时称为合同价格的价格相同，即农民在一定年限内签订合同向经销商交付一定数量玉米的价格。