wood grain的用法和樣例：
例句
- First, original co-occurrence matrix feature parameters of wood were extracted in noise condition, earned on feature selection, and constructed parameter system of wood texture.
首先在無雜訊的環境下提取了木材的共生矩陣紋理原始特徵參數，並對其進行特徵選擇，進而建立了木材紋理參數體系。 - Cleaning exposed the grain of wood.
清潔使木紋顯現可見。 - In splitting wood,don't try to go against the grain.
劈木柴時，要順著木紋劈。
