We enclose a trial order.

兹随函附上试订单一份。

We'll send a trial order.

我们会寄上试订单。

We intend to book a trial order with you.

我们想向你方试订一批货。

We should be grateful for your trial order.

如承试订货，不堪感激感动。

We should be grateful for your trial order.

如承试订货，不胜感激。转自派特森英语。