1、be a matter that requires serious attention
2、be far from being an easy task
3、be no small matter
4、lack intelligence
5、hold significant meaning
6、contain no substances that are prone to evaporation
7、be of great importance
1、be a matter that requires serious attention
2、be far from being an easy task
3、be no small matter
4、lack intelligence
5、hold significant meaning
6、contain no substances that are prone to evaporation
7、be of great importance