易混淆的单词： Sheaths

Leaf sheaths smooth ; spikelets yellowish green or pinkish .

叶鞘平滑；小穗黄绿色或带粉红色。

Their claws are kept sharp by being retracted into sheaths .

它们的爪子平时缩进皮鞘里，藉此保持锐利。

In the spleen , most of the lymphocytes of the red pulp are b cells , whereas those of the periarteriolar lymphoid sheaths are t cells .

在脾红髓的淋巴细胞大部分是b细胞，而在动脉周围淋巴鞘的是t细胞。

Embarrassed officials are now appealing to people carrying such id cards to keep them safely tucked away in metal sheaths .

尴尬的官员们呼吁，携带这种身份证的人要把他们塞在金属套里。

Leaf sheaths and blades scabrid ; ligule glabrous on back .

叶鞘和叶片粗糙；在背面上无毛的叶舌。