泰坦星对卡西尼号牵引力的细微变化表明，该星球内部为冰和岩石的混合物，且没有明晰的岩石分界线。
Subtle differences in Titan's pull on Cassini suggest that the materials inside the moon are a mix of ice and rock with no clearly defined rocky layers.
张力是一种相互牵引力，它可以分为内部张力和外部张力。
Tension is a mutual pulling force. It can be divided into internal tension and external tension.
原因是感应探头的探测范围太小或者内部有积尘现象； 门体太重，超出了主机的马达牵引力。
The reason is that the detection range of the probe is too small or there is dust inside the door, the door is too heavy, beyond the host motor traction.
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