你可以摒弃生活中那些并不怎么有用的，并不怎么美好的，并不怎么令人开心的事物。
You can get rid of anything that isn't useful, beautiful or joyful in your life.
我一直在拖延这三件事，大多时候就是不搭理他，但这一招从今天看也不怎么有用了。
I've been stalling on all three fronts, mostly by ignoring him, but that strategy is looking less effective by the day.
随时间流逝，模型的维护(当模型不怎么有用，但您为了它的后代产品仍然需要维护它时，这种情况甚至会更糟)？
Maintenance of the model over time (it's even worse when the model has outlasted its usefulness but you're still maintaining it for posterity)?
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