Exocycloida
外环形棘皮目
🗣️ 情景例句
English is the language of aviation.
英语是航空语言。
Trust thyself only,and another shall not betray thee.
只要信任你自己，旁人才不出卖你。
I'm sorry to have done that. I didn't mean to be so rude.
我为那样做感到抱歉。我并不想那样粗鲁的。