You must first if all acquaint yourselves with the market.

你必须首先要？解市场情况。

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You must first of all acquaint yourselves with the market.

首先，你们必须要了解市场情况。

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We are enclosing a catalogue and a price-list for your reference, so that you may acquaint yourselves with some of the items we handle.

为使贵方对我方所经营的产品有所了解，今特随函附寄产品目录及价目表，以供贵方参考。

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