Each of these test levels has unique objectives and requires different sets of inputs to achieve solid test coverage, but all can draw value from the project's use cases.
每个测试水平都有唯一的不同输入设置的目标和需求来达到可靠的测试覆盖率，但是所有的测试水平都能够从这个项目的用例中获取一定的价值。
One case concerns an eleven-one schoolgirl, Vera Petrova, who has normal vision but who can also perceive things with different parts of her skin, and through solid walls.
一则报道说一位名叫维拉裴楚娃的十一岁女学生，有着正常视力，却也能够用自己不同部位的皮肤感知事物，并可透过坚固的墙看见物体。
A solid is different from a liquid is that the solid has a definite shape.
固体和液体不同点在于固体有一定的形状。
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