It has been the main producing area and distributing center of raw silk materials in China.

它一直是中国丝绸原料的主要产地和集散中心。

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Su-131 block and Bei-301 block in Hai-la-er Oilfield are main producing area, and they have features of acid sensitivity and water sensitivity respectively.

海拉尔油田苏131、贝301区块试验区是海拉尔油田的重要产区。 其储层分别表现为强酸敏以及强水敏的特性。

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An earthquake in April that struck a main producing area in Qinghai province is part of the reason, traders say.

ECONOMIST: Rising prices in even the most exotic products