Polcarb
碳酸鈣鹽
??? 情景例句
To the patients in the ward?
讀給病房里的病人？
I don't know how to work the machine.
我不懂得怎樣使這部機器運轉。
Yes, there is. Walk along this road, and take the fourth turning on the left.
是的，有。沿這條道走，然后在第四個路口向左拐。