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It exists T here has existed There exists It has existed
you are the stand-on vessel risk of collision exists a special circumstances situation exists the other vessel is dead in the water"
You are the stand-on vessel Risk of collision exists A special circumstances situation exists The other vessel is dead in the water"
should exist; masters exist; controls exists; masters exists; controls
animals are the same as human beings animals can be as clever as human beings the dividing line between culture and animal culture no longer exists animals may have a culture like our own
culture shock is an occupational disease culture shock is caused by the anxiety of living in a strange culture culture shock has peculiar symptoms it is very hard to cope with life in a new setting
it exists there exists it is existed there is existed
as much about a culture as as a much about culture as so much about a culture as such a much about culture as
SELECT 学号，姓名，性别 FROM S WHERE EXISTS (SELECT * FROM SC WHERE S学号=学号 AND 成绩＜=85) SELECT 学号，姓名，性别 FROMS WHERE NOT EXISTS (SELECT * FROM SC WHERE S学号=学号 AND 成绩＜=85) SELECT 学号，姓名，性别 FROMS WHERE EXISTS (SELECT * FROM SC WHERE S学号=学号 AND 成绩＞85) SELECT 学号，姓名，性别 FROM S WHERE NOT EXISTS (SELECT * FROM SC WHERE S学号=学号AND成绩＜85)
SELECT*FROM 学生 WHERE EXISTS； (SELECT*FROM 选课 WHERE学生号=学生.学生号) SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生.学生号) SELECT*FROM 学生 WHERE EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号) SELECT*FROM 学生 WHERE NOT EXISTS； (SELECT*FROM 选课 WHERE 学生号=学生号)
animals are the same as human beings animals can be as clever as human beings the dividing line between culture and animal culture no longer exists animals may have a culture like our own
vacuum emptiness blank space
animals are the same as human beings animals can be as clever as human beings the dividing line between culture and animal culture no longer exists animals may have a culture like our own
sometimes never always hardly
retains exists keeps holds.
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