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.
如今13岁的萨曼塔成绩一落千丈，沉迷于发短信、上Facebook、玩手提电脑，有时还抓着电话和衣而睡。
Now 13, Samantha's grades have slipped drastically and she's obsessed with texting, Facebook and her laptop, sometimes falling asleep in her clothes clutching her phone.
等他的身体恢复之后，到学校上课，由于缺课，他的成绩一落千丈，从九十几分迅速地降到了六十分以下，他很苦恼。
After his recovery, to school, because of absence from school, his grades plummet, from ninety something dropped to below 6 very fast, he is very upset.
超过一半的学生会发现，当他们进入九年级之后，他们的学习成绩会一落千丈。
More than half of students will find their academic performance declining sharply when they enter the ninth grade.
老师也渐渐不管我了，我就更加放纵自己的行为，成绩更是一落千丈。
Teachers gradually take care of me, I will be more indulgent of his behavior, grades are even more plummeted.
第四，一旦物质刺激结束，各科成绩将会一落千丈。
Fourth, once the incentive program ends, grades will fall in all subjects.
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!
于是我开始失眠，非常在意别人对我的评价，人多的地方是再也不敢去了，成绩也跟着一落千丈。
Then I am suffering insomnia, really care about other's opinions on me and unwilling to go to the crowded places any more. Furthermore, I can not perform as well as usual.
于是我开始失眠，非常在意别人对我的评价，人多的地方是再也不敢去了，成绩也跟着一落千丈。
Then I am suffering insomnia, really care about other's opinions on me and unwilling to go to the crowded places any more. Furthermore, I can not perform as well as usual.
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