Maintain Supersonic for 20 minutes at least in your flight.
航程至少应保持20分钟得超音速飞行。
Maintain regular visits to the dentist. Go at least twice a year.
经常看牙医，每年至少两次。
Maintain a distance of at least 60 cm between and the computer screen.
使用电脑时应与萤幕保持60厘米以上的距离。
But the coat should be stripped at least once a year to maintain the harsh self cleaning coat.
但外壳应剥掉每年至少一次，以维持自身苛刻清洗外套。
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