1.close approximation of 近似
A Fibonacci spiral, which is a close approximation of a golden spiral.
斐波那契螺旋是黄金螺旋线的近似表达PzFPlW~t4|W。

2.hard copy 打印稿
They also said they would mail me the hard copy, so I'll let you know as soon as I get it.
他们还说过要再给我一份打印稿，我一收到就尽快通知你dE.lXh@yvVn4h。

3.raise one's concern about 表达某人对某事的担忧
Huang raised his concern about some small illegal studios mainly because they may affect the larger industry in the long run.
黄提出了他对一些小型非法工作室的隐忧，主要是因为从长远来看，这些工作室可能会影响到整个行业的发展Dvzs7_r-lglWiDWq7.。

4.the gravity of ……的严重性
He doesn't seem to understand the gravity of the situation.
他似乎没有意识到形势的严重性i7A=j^PaRnmsryLOg。