Serpex
塞佩克斯碱性耐火材料
🗣️ 情景例句
to plan the refurnishing of the old library
计划重新整修老图书馆
He concentrated solely on law studies.
他把全部精力只用于攻读法律。
They can't pick up the small pieces with their fingers.
他们用手指拿不起小零件。