第一句：The service is too slow.
服务太慢了。
A: Can you tell me what's wrong, sir?
能和我说说有什么不妥吗，先生?
B: The service is too slow and the dishes are served cold.
服务太慢了，菜都凉了。
A: I see. I'll report to the manager.
我知道了，我会把这事告诉经理的。
第二句：There is too much salt in the soup.
汤太咸了。
A: Is everything to your satisfaction?
您对饭菜满意吗?
B: Yes, all the food was delicious except that there is too much salt in the soup.
是的，除了汤太咸之外，所有事物都不错。
A: I'm so sorry for that. I'll take it to the kitchen and get you another one, if you like.
真对不起，如果您愿意，我拿到厨房再给您换一下。
若饭菜质量有问题，可向服务员提出意见。还可以用“There's something wrong with...” 这个句型表示“某事或某人有点儿不对头。”
The meat is underdone. 是说肉没熟，而overdone则是“过头了”;
I'm afraid this is too salty for me. 我觉得菜太咸了。
too sweet 太甜;That's not what I ordered. 那不是我点的。
要提意见，应该说：I want to make a complaint.
