Pessimistic session locking should be used with great discretion, as it serializes access to data across a business process that includes user think time.
必须谨慎使用悲观会话锁定，因为它在业务流程（包括用户思考时间）中序列化数据访问。
2
The optimism all saw in each time the danger to the opportunity, but the pessimistic person all saw in each opportunity to the danger.
乐观者在每次危难中都看到了机会，而悲观的人在每个机会中都看到了危难。
3
"You could spend a lot of time ruminating," says Lyubomirsky. "But that just makes you feel even more pessimistic, more out of control, and effects your self esteem."