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Yes, running may be used as an adverb in some context.
Who told you that? No you can't ruin a car engine by running the air or heat while sitting in one place for an extended period of time. It's not good for the engine to sit for a long time running because oil builds up on the seals and such but that's about it.
it can, if you do not exercise beforehand and suddenly apply more force than usual over an extended period of time.
yeah lol u'll prob end up with a cold, the flu or worse
The extended period at the wicket by two batsmen in cricket is called a stand.
the study of how artifacts and objects decay over an extended period of time
No
It's HOT where the firefighters tend to work. Most things burn, or at least melt, and I can be positive that they would do one of those such things under extreme conditions for an extended period of time.
Yes, black widows usually dwell in one place for an extended period of time.
Perhaps she was really interested in you, but lost interest when you did not respond in kind for an extended period of time.
malnutrition
Yes, they can sit but not for an extended period of time.