Limonitization
褐铁化作用
🗣️ 情景例句
What subject did you major in university?
你在大学主修的科目是什么？
Have a nice Thanksgiving!
感恩节快乐！
The slope averages about 1 in 30, but contains steep,
坡度平均约为1/30，但其中包括陡峭的，