我指着黑板。
And suppose I'm rotating it about an axis perpendicular to the blackboard through that point.
假设我将其绕着，通过这点垂直于黑板，的轴旋转。
指着黑板结束。
Point the left mouse button to pick up the effaceurs blackboard , the blackboard of dirt on vacuum cleaners , to clean.
点鼠标左键拿起板擦来擦黑板，板擦脏了要放在吸尘器上清洁。
Point the left mouse button to pick up the effaceurs blackboard , the blackboard of dirt on vacuum cleaners , to clean.
点鼠标左键拿起板擦来擦黑板，板擦脏了要放在吸尘器上清洁。
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