第四级是高度自动化。
日本的核安全机构估计第四级在福岛事故。
Japan's nuclear safety agency has estimated the accident at Fukushima at level four.
目的：探讨在核舰船核事故应急体系中把海上应急状态划分为第四级（类）的可行性。
Results: A profile was made pertaining to maritime emergency status in case of nuclear accidents .
专业四级考试在英语专业第四学期举行，每年一次。
Once a year, TEM4 is held at fourth term among English Majors.
专业四级考试在英语专业第四学期举行，每年一次。
Once a year, TEM4 is held at fourth term among English Majors.
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