mi two
mi two-
What 's more , time velocity integrals in some segments of MI group had two wave crests , reached maximum in isovolumic relaxation phase , but were still lower than that of control group .
此外，梗死组多个节段时间速度积分出现收缩期末和等容舒张期两个波峰，TVImax较对照组明显下降。
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Chief among them are Google 's self-driving cars . Google 's driverless cars have traveled over 480000 kilometers ( 300000 mi ) with only two accidents , both of which were caused by humans .
谷歌的自动驾驶汽车是此行业的领头羊，已行驶48万千米（30万英里），仅发生过两次交通事故，还都是人为因素造成的。