Polypodiatae
水龙骨纲
🗣️ 情景例句
It's about the size of the United States, but it has a population of only 16.5 million.
它和美国一般大，但人口却只有一千六百五十万。
I'm willing to agree to your plan.
我愿意同意你的计划。
Sally is leaving tomorrow and coming back on Saturday.
傻俐明天走，星期六回来。