These categories are not well defined.
这些类别划分得不太明确。
The natural course is variable and not well defined.
临床进程是可变的并且不能很确定。
Yes? Well, though actually it's not defined because the curl is zero everywhere else.
即使中心是没有定义的，旋度在其他地方也可以是处处为0的。
You might end up with a potential that is not well-defined.
你可能会得到，一个没有明确定义的势函数。
It's not easy, but at least the challenge is now well-defined.
这是不容易的，但至少现在挑战是很明确的了。
These limits, particularly the upper one, are not very well defined .
这些界线，不是很严格的，尤其是上线。
The stop is well defined, although not abrupt.
止部非常清晰，但不很陡峭。
The stop is well defined, although not abrupt.
止部非常清晰，但不很陡峭。
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