写作：Because this is an article of the special present for my birthday I received ever since I've just been a High-School student.
语法：
1、特别的生日礼物：the special present for my birthday。
2、时间状语：ever since + 现在完成时。
3、just 表示“刚刚”，通常与完成时态搭配。
很高兴为您解答~
翻译为：This is the very special present I have received since i entered Senior Middle schoo.
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谢谢~
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