Study subjects were grouped according to the amount of activity they reported.

根据研究对象的活动量将其进行分组。

Political opinion or membership in a particular social group according to the 1951 convention.

根据1951年的公约，政治观点或某一社会群体的成员。

Psychoactive substances are commonly grouped according to whether they are stimulants, depressants, or hallucinogens.

精神活性物质通常根据兴奋剂、镇静剂或致幻剂进行分类。

Children are in groups according to their abilities, and often, they can choose what they want to study.

孩子们根据自己的能力分组，通常他们可以选择自己想学习的内容。

Bitcoin does not use printed money. It is digital only. The currency is created on computers by a community of people across the globe. Anyone can join that network, or group, according to Coindesk.com.

比特币并不适用印刷的钱币，它只是电子货币，这种货币是由全球各地一个社区的人们用计算机创造的，Coindesk.com称任何人都可以加入这个网络或组织。