Pinnigrade
a. & n.用鳍(或鳍状肢)行走的(动物)
🗣️ 情景例句
Three. Besides Chinese, my mother tongue, I can also speak English and French.
三种，除了我的母语中文外，我还会讲英语和法语。
One woe doth tread upon another's heels.
祸不单行。
Many pedal their tricycles, but most of them prefer to push or drag them.
很多孩子用脚蹬车，但多数孩子更愿意推或是拉着三轮车。