Whats the different between "direction" "orientation" and ”sense“

怎么翻译成中文，我要交作业 how to translate to chinese： The two observers each have a frame of reference, in which, they observe motions, and, if the elevator is descending steadily, they will see behavior that is consistent with those same physical laws.

hi~can you help me？ Who can share me an article called "a slow boat to china" Its comes from a short stories《the elephant vanishes》write by Haruki Murakami