1£®(2019·Ìì½ò¾í)Scientists have discovered the rules governing food webs of the ecosystems with the help of mathematical models of food webs.                                                                    ¿ØÖÆ

2£®(ºþÄϾí)I didn't want to lecture£¬but I wanted other diabetics to know that things get better when we're self­controlled and do our part in managing the disease.                                    ˵½Ì