Wood... but the spherical sound box is fashioned out of a whole coconut shell.
木头……不过球形的音盒是整个椰子壳做的。
In this paper a series solution of spherical shallow shell with circular base is given.
本文中提供圆底球扁壳的一种级数解法。
In this paper a series solution of spherical shallow shell with circular base is given.
本文中提供圆底球扁壳的一种级数解法。
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