1.algebra
代数学（用字母或符号代替数字）
Big test today，right？I always hated algebra. All those Xs and Ys made my head spin.今天有大考对吧？我以前恨死代数了。那些什么X啊Y啊，搞得我稀里糊涂的。
2.barbaric
野蛮的，凶残的：extremely violent，cruel or uncivilized
This is barbaric use of a barbaric weapon against innocent people.
这是用残暴武器针对无辜平民的野蛮行为。
How can we expect to be civillized when we live in such a barbaric world？
如果我们生活在一个如此野蛮的世界，又怎么能期待文明呢？
3.delinquent
少年犯，行为不良的青少年
a young person who has broken the law or behaves in a way that is socially unacceptable
There's juvenile
