Particles placed at the top of either slope would fall down to the bottom under the pull of gravity. Particles placed at the bottom of either slope would go nowhere.
在重力的拉动下，放在任何一个斜面顶部的粒子都会滚到底部，而放在底部的粒子会保持不动。
Five, skillful top and bottom ascent, low block steady pass, midway don't change to block, the ascending grade defends to turn off, go down slope absolute prohibitory for nothing block a skidding.
巧妙上下坡，要低挡平稳通过，中途不要换挡，上坡防熄火，下坡绝对禁止空挡滑行。
We don't want to go down the slippery slope of banning activities like this.
她说：“我们不想一下子就完全禁止这种行为。”
We don't want to go down the slippery slope of banning activities like this.
她说：“我们不想一下子就完全禁止这种行为。”
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