practising class的用法和樣例：
例句
- Plant physiology experiments are large and complicated, but class hours are limited.
摘要植物生理學(xué)實(shí)驗課數量多，內容復雜，但學(xué)時(shí)有限。 - The preparations for biological experiment class mainly consist of dominant materials and recessive materials.
生物實(shí)驗課的準備主要包括顯性和隱性材料的準備兩個(gè)方面。
