You may rest assured that I will do my best.

请放心,我一定尽力.

You may rest assured that we shall do all we can.

你可以放心我们一定会尽力而为.

You may rest assured that we will not fail this trust.

你们放心,我们一定不辜负你们的信任.

You may rest assured that your order will be fulfilled as contracted.

请放心,我们会如约履行定单.

You may rest assured that whatever we offer you excels in workmanship and function.

你们可以放心，我们提供的设备工艺精、性能好。

You may rest assured that our export packing is up to international standards.

请放心，我们的出口包装达到国际标准。

You may rest assured that we will take all precautions we can to avoid any possible damage to the cargo en route.

你尽管放心我方会采取一切措施防止货物在航程中遭受任何损失。