So take a piece of roving about 16 ins long and pull it apart longways so you have two 16ins long bits and tie a knot in the middle of one.
所以你需要要一块粗纱约16英寸长,把它开,那么你就有两根了,在一根中间系一个结。
So take a piece of roving about 16 ins long and pull it apart longways so you have two 16ins long bits and tie a knot in the middle of one.
所以你需要要一块粗纱约16英寸长,把它开,那么你就有两根了,在一根中间系一个结。
Moons are generally thought to form in one of two ways - either by coalescing from the same cloud of debris as their parent planet, or as wandering objects captured by the parent's gravitational pull.
卫星通常被认为形成于两种途径:一是由它们母星的同性云状碎片合并而成,一是被母星重力抓住的游离天体。
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