1.I must stress that goods were strictly inspected before shipment with your representative on the spot.
我必须强调，货物装船前经过严格检验，而且你方代表也在场。
2.Let me emphasize how necessary it is to abide by the contract.
3.I can't stress enough the disastrous consequences of breach of contract.
我必须强调，违约会带来严重后果。
4.I must call your attention to the distinction between these two samples.
我要提请您注意两个样品之间的差异。
单词解析：
inspected；abide by；consequences这三个词（组）在商务谈判中，尤其是涉及到商务合同的时候都是非常实用的。Inspect通常是指对货物的检验；abide by是指对合约，合同的遵守；consequence通常是指出现某种情况的后果。