It could be a challenge, but who said testing was easy?
但这是一项挑战，谁能说测试工作是简单的呢？
Why is testing always a challenge?
测试为什么经常是个挑战呢？好？
The other big challenge I see is in testing.
另一项挑战工作是测试，有很多问题是很难通过测试发现的。
The challenge is testing this business logic without testing the data access logic.
难点是对业务逻辑进行测试而无需涉及数据访问逻辑。
The challenge is testing this business logic without testing the data access logic.
难点是对业务逻辑进行测试而无需涉及数据访问逻辑。
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