smartphones

She checks her smartphone every morning as soon as she wakes up.

用法提示：smartphone 是名词，指带强大计算功能的移动电话，这里作 checks 的宾语，前面用 her 修饰。

My old smartphone still works, but the battery runs out very fast.

用法提示：smartphone 作名词，在句中作主语，由形容词 old 和物主代词 My 修饰，指一部具体的手机。

He bought a new smartphone with a bigger screen so he could watch videos more comfortably.

用法提示：smartphone 作名词，是 bought 的宾语，用 a new 限定，表示他购买的一部智能手机。