For readers with an interest in further information, but limited time, a few key references are starred (*).
a few key references are starred.
No key references are starred for the reader.
The man is working in the laboratory.
A man passes an escalator.
The island is struggling to support its population.
Colorado Legal Services found migrant workers are never treated poorly.
Both of them quit the project because they didn't care about getting it done.
There are people riding in inclement weather.