dear ms. wong，
we placed an order for 100 units of model xz325 more than 5 weeks ago. as you know, we stipulated that delivery should be within 4 weeks but as yet they have not arrived.is there any reason for this delay?could you please look into this for me as we have several customers who are urgently requiring them from us?
yours sincerely，
mike wang
亲爱的黄女士：
我们在5个多星期前订购了100台型号为xz325的产品。如你所知，我们在合同中约定4周内交货，但迄今为止，我们还没有收到货。是什么原因导致了交货延误?请您为我调查一下，因为我们的许多顾客正在急切地向我们催要货物。