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ahnhyunmin
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bb
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ahnhyunmin
-It is on China’s doorstep, astride the trade routes along which oil and other raw materials are transported to China and finished goods are shipped out

hi

i don't understand why comma use between
doorstep and astride.

is it a modifier?

Posted from my mobile device

the dictionary meaning of astride is below.

astride : with a leg on each side of.
e.g.
"he was sitting astride the bike"

So I think the meaning is .. Something is on China’s doorstep . That doorstep includes each side of the trade routes along which oil and other raw materials are transported to China and finished goods are shipped out...

I believe the clause ',astride ....' is giving additional info on the China’s doorstep .

But anyway .. I second bb on the fact that it will be really helpful in getting the exact context if we have the full sentence .