to do
[动词]
to perform an action that is not mentioned by name

做, 干
Ex: When you 're feeling overwhelmed , it 's okay to take a break do nothing for a while .
research
[名词]
a careful and systematic study of a subject to discover new facts or information about it

研究, 调查
smartphone
[名词]
a portable device that combines the functions of a cell phone and a computer, such as browsing the Internet, using apps, making calls, etc.

智能手机, 智能通讯设备
to create or choose a course of action from various options after considering the available information and potential consequences

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