Researchers have already begun to use smartphones in social scientific research, either to query people regularly as they engage in their normal lives or to record activity using the device's built-in sensors.
2018年12月六级真题(第一套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
内置的;嵌入式的
Built-in devices or features are included in something as a part of it, rather than being separate.