This is the 62nd most frequent Russian word.
сейчас
"Сейчас" - "now" or "currently."
Here, 'сейчас' specifies that the action is happening at the current moment.
Я сейчас читаю книгу.
I am reading a book right now.
In this case, 'сейчас' emphasizes the present circumstances dictating the safety of the action.
Сейчас идти гулять небезопасно.
It is unsafe to go for a walk right now.
Here, 'сейчас' is used to refer to the present period or era in a broader sense.