刚刚好正好用英文怎么表达？

I experimented until I got the recipe just right.

我不断地尝试，直至找到正合适的烹饪法为止。

He was just right for the part.

他是那个角色的'不二人选。

Sand this fine will be just right.

这样粗细的沙子最合适。

He seemed to be just the right sort for the job

他似乎正是干这个工作的合适人选。

As for doctors, when you go to see them they just look right through you.

说到医生，你去看病时，他们直把你当透明的。