1、We'd like to know your availability and conditions of sale of this line.
我們想知道你們在這方面的供貨能力及銷售條件。

2、We 'd like to know the availability and the conditions of sale of this line.
我們想了解一下你們在這方面的供貨能力和銷售條件。

3、We'd like to know the availability and the conditions of sale of this line.
我們想了解一下你償在這方面的供貨能力和銷售條件。

conditions of sale翻譯