Polycrystallinity
多晶性, 多晶结晶度
🗣️ 情景例句
My parents set aside a college savings fund for me.
我的父母为我存了一笔上学的费用。
How long will it take to have this radio fixed?
修理这收音机要多久？
OK, Mom! said Lucy.
“好的，妈妈！”露西说。