短语讲解：

1. When someone comes to your front door and rings the doorbell, the light can turn on immediately.

turn on 打开（水、电视、收音机、灯、煤气等）
例句：I want to turn on the television
我想开电视。

2. Another use of smart home technology is being able to watch what is taking place in your home – whether you are just around the corner or half way around the world.

be able to 能够; 能，会
例句：They may be able to help with childcare so that you can have a break
他们可以帮忙照料孩子，这样你就可以歇一歇了。
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