英语翻译两个工作日了也没有收到X的回复,感觉X效率很低；我建议使用Y来完成这笔交易,因为Y是中国最大的中介机构,这为我们的交易提供更多的方便.

We have not received any news from X for two working days.He works with low efficiency.I suggest do do this business with Y,for he is the biggest Intermediary institution in China,which makes a big convinience for our deal.