Just because the other kids have motor scooters is no reason for you to stop riding your bike to school.
只是因为其他的孩子都有电单车上学,不足以成为你不骑车上学的理由。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此,我们所知道的现有恒星数目估计约有30亿×1000亿颗。