天空广阔无边，一眼望不到头；天空包罗万象，有许许多多的奥妙；天空变化多端，真叫人琢磨不透；天空留给人们许多美妙的遐想。天空晴朗时，碧空万里，天空蓝得新鲜，蓝得透明，蓝得自然，蓝得清澈，蓝得好看。, Continue to labor is the iron law of life, is also the iron law of art.