但是，谁知，到了高中的后，我的成绩一落千丈。
However, who would ever know, my performance went into a nose dive when I came into the high school.
我的学业成绩一落千丈，我的父母也为此十分不高兴。
My academic record took a nose dive, my parents were very angry about this.
妈妈：小约翰尼的老师打来的——他的成绩最近一落千丈！
Mom: Junior's teacher called-his grades have slipped a lot recently!
妈妈：小约翰尼的老师打来的——他的成绩最近一落千丈！
Mom: Junior's teacher called-his grades have slipped a lot recently!
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