pallets是托盘的意思，而packages则是包装或者包裹意思，区别可以从以下例子看出：

The bottom wood is only pallet, which supports your package, you can throw it away or return it to your supplier. 底部木材只是托盘，可以支撑您的包裹，您可以将其扔掉或退回给您的供应商。