deficiency of yang affecting yin

例句：

1. 1. Thefood was so rich that there was noneed for a deficiency in the diet.
   食物如此丰富，以至于饮食中不需要补充。
2. 2.The teacher noticed a deficiency in the student's understanding of the material.
   老师注意到学生对材料的理解存在不足。
3. 3. The companyis facing a shortage of skilled workers dueto a recent downturn in the economy.
   由于最近经济衰退，该公司面临熟练工人短缺的问题。