染雾tough (a.) 强硬的，艰难的
tough (a.) 强硬的`，艰难的A: Russian is a tough language to learn.
俄文是个很难学的语言。
B: I know. It makes Fre
我知道。法文相形之下都变简单了。
tough (a.) 强硬的，艰难的
tough (a.) 强硬的`，艰难的A: Russian is a tough language to learn.
俄文是个很难学的语言。
B: I know. It makes Fre
我知道。法文相形之下都变简单了。
