如果没有足够的信息，对测试人员来说创建一个坚固的测试用例组合是十分困难的。

Not enough information makes it difficult for testers to create a robust test - case suite.

youdao

比如，鸟有中空的骨头，昆虫根本就没有骨，而大部分哺乳动物都有坚固而又沉重的骨头，这就使得飞行变得很困难。

For example, birds have hollows bones, and insects have no bones at all. But most mammals have solid and heavy bones, which could make flying tough.

youdao

进入网课班是多么困难，而这个小升初成为我进入“七中”一个坚固的大门，而这个大门是阻碍我“杀入”网班的一个大将。

Enter the net class class how difficult it is, but this among become me into the "7" a solid door, and the gate is blocking me a general "into" net class.

youdao