00:12:56,800　　有三个答案　　Now,okay,there are three answers,　　267　　00:12:56,860 --> 00:12:57,930　　没一个是正确的　　None of which are correct.　　268　　00:12:58,000 --> 00:13:00,000　　正确的答案是"当[路面]被覆盖上　　The correct answer is "when covered by　　269　　00:13:00,060 --> 00:13:01,560　　一层液体足以　　"a film of liquid sufficient to reduce　　270　　00:13:01,630 --> 00:13:03,000　　把轮胎和道路之间的静态摩擦系数　　"the coefficient of static friction　　271　　00:13:03,060 --> 00:13:05,100　　减少到理论上的零值　　"between the tire and the road to essentially zero,　　272　　00:13:05,160 --> 00:13:08,000　　又不产生新的摩擦源"　　But not so deep as to introduce a new source of friction."　　273　　00:13:12,730 --> 00:13:15,260　　这是你的学习证明　　走开　　Here's your learner's permit. go away." type="audio/mpeg" />-->