Grade 7 七年级
Coumarin 7 laser grade pure 香豆素
Luteolin-7-glucoside HPLC grade 黄色素
geography in grade 7 七年级地理
What did Peter lose in Grade 7?
彼得在七年级时失去了什么？
I joined the basketball team when I was in Grade 7.
我七年级时加入了篮球队。
Brazil is among the world champions in grade repetition, with 30% more children in primary school than the total in the 7-14 age group.
巴西的年级重复率挤身于世界前列，其在校小学生的数量竟然比7 - 14岁的儿童总数还多30%。
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