Four words of mathematics

One eye and ten lines are serious, make a clean break and be spotless. It was smooth sailing, smooth sailing and dispersed in a hubbub. You should love at first sight, kill two birds with one stone, strike first, as before, be ignorant, poor, accomplish nothing, be meticulous, endless, pour thousands of miles and devote yourself wholeheartedly. It's a deal. Hit the nail on the head. Two sides and three knives, remain uncorrupted, two tigers fight, two tigers fight for three years. Three transgressions of five times, three visits to the thatched cottage, three religions and nine streams, three transgressions and five times, three transgressions and three times and two times, three heads and six arms, three hearts and two minds, four directions, four directions, four directions, four directions, four directions, four directions, four colors and all kinds of food, no matter how rich the six parents are. Ten steps beyond the cloud, the grass is heinous, the wind and rain are ten days, the tree is ten years old, and the tree is a hundred years old. Ten sheep, nine beasts, nine beasts and ten cold windows cross the street and go further.