锤子的巧妙设计,再也不必用手按住钉子再往里敲了,The ingenious design of the hammer does not need to hold the nail in hand and knock again.
锤子的巧妙设计,再也不必用手按住钉子再往里敲了 - The ingenious design of the hammer does not need to hold the nail in hand and knock again.:Wait for you to sit on the sofa!