The starting point is the box-in-box principle.
出发点是“盒中盒”原则。
So just to hammer home this point, for now, a function really is like a black box.
现在再三强调，让你们彻底了解这一点，一个函数就像是一个黑盒子。
For practice, point to this box, click in it, and type the words [California driving].
要实践的话，指向这个搜索框，点击它，输入californiadriving。
You pick this point by placing the focus box on the subject.
你要做的就是把取景框对准你要对焦的点。
Supply LED light source, digital point light source, LED lights, box lights.
供应LED点光源，数码点光源，LED灯，方块灯。
Supply LED light source, digital point light source, LED lights, box lights.
供应LED点光源，数码点光源，LED灯，方块灯。
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