Then A is positive semidefinite, negative definite and negative semidefinite.
一封好的商业书信应该是明确的、直截了当的。
Perhaps this trend of singlehood will have a definite negative impact on society!
可是单身的趋势也必然会给社会带来一定的负面影响啊！
Perhaps this trend of singlehood will have a definite negative impact on society!
可是单身的趋势也必然会给社会带来一定的负面影响啊！
应用推荐