《韩非子·显学》
自然长成的直杆和圆木，既然千年万载也没有一个，那为什么大家还都能有车坐、还都能射箭打猎呢？
自直之箭，自圜之术，百世无有一，然而世皆乘车射禽者何也？
Since there are no naturally straight shafts and round logs, why is it that everyone can ride in carriages and hunt with arrows?