検索内容:
source of supply
We need to find a new source of supply.
頁岩: shale / 結願:
Shale is one of the main sources of oil and gas.
main, principal
This is our main goal.
centrality
He played a central role in the project.
one thing
He ate one apple.
oil, petroleum / kerosene
Oil is an important element of the world economy.
supply, provision
The power supply in this area is stable.
to supply
We supply fresh vegetables to the market.
shale
This area is rich in shale.
a fountainhead (source of a river) / a source, origin
The source of this river is halfway up the mountain.
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