There are many Beths in the world, shy and quiet, sitting in corners till needed, and living for others so cheerfully that no one sees the sacrifices till the little cricket on the hearth stops chirping, and the sweet, sunshiny presence vanishes, leaving silence and shadow behind.
我不认为有什么极限。
The man who is fit to work at any particular trade is unable to understand the science of that trade without the help and guidance of those who are working with him or over him.