例句與造句

1. The virulent strains had a polysaccharide capsule and formed smooth colonies on agar medium .
   有毒菌株具有多糖莢膜它在瓊脂培養(yǎng)基上形成光滑的菌落。
2. It's difficult to find smooth colony in a sentence. 用smooth colony造句挺難的