Second, let's talk about the practical protection significance of this layout. The products to be protected include pillows in supine position and pillows in supine position and lateral position, and only pillows in lateral position are not covered by this writing.
Third, if we want to protect the lateral position and the supine position respectively, we can see whether they are unitary, protected by two sovereigns respectively, or protected by a superior person; If all this fails, it can be protected as two applications.