Tom is a student and he can buy a fitnessband for 640 yuan.
汤姆是一个学生，他可以花640元买一个健身带。
2
In other words, it does everything that a proper fitnessband is supposed to do.
换句话说，它会做一个适当的健康追踪器应该做的一切。
3
On a genetic level, the finding that members of a band are not highly interrelated means that “inclusive fitness cannot explain extensive cooperation in hunter-gatherer bands, ” the researchers write.