keep off（使）不接近；挡住；（雨、雪等）没有下；（使）不接近于；
例如Keep off the grass, please!
Keep off the lawn [ grass].
请勿践踏草地。
Keep off at your peril!
走开，否则发生危险自己负责！
The doctor has advised him to keep off fattening food.
医生已建议他不要吃致肥食物。
水利万物而不争,
而万物莫能与之争。
