Petrium
砾石群落
🗣️ 情景例句
His books exposed people to new ideas.
他的书使人们接触了新思潮。
Don't let his criticisms bother you.
别因为他批评你而感到烦恼。
The first records the arrival of longitudinal vibrations.
首先记录下的是纵向波的到达；