In the last sentence, there appears to be some ingredient of uncertainty. Suppose it was a teacher who caught a pupil dishonest. The Trainer could give an incomplete, however the administration may fail him. In that situation the Trainer would say 'but': 心理账户：社交平台上“用华强北被同事识破”的社死现场，让不少人宁愿“吃土三个月也要买正品”。 Typically, these operations aid minimize sp... https://goo.gl/maps/4n1J31u6uuphv4qV9