episterna
「episterna」的意思
n. 上胸骨；海胆的上腹板；前侧片（episternum 的变形）
n.pl.上胸骨,胸骨上端(episternum的复数形式)
「episterna」的用法
episternan. 信封 - 在写信时使用
「episterna」的例句
He put the letter in an envelope.
他把信放在信封里。
She received a letter in the mail.
她收到了一封信。
The postman delivered the envelope to the mailbox.
邮递员把信封送到邮箱里。
She wrote a letter to her friend in the envelope.
她把信写在信封里寄给了朋友。
The envelope was addressed to the wrong address.
信封上的地址写错了。
He opened the envelope and found a surprise inside.
他打开了信封，发现里面有一个惊喜。
She sealed the envelope with a sticker.
她用贴纸封住了信封。
The post office asked for an envelope with more stamps.
邮局要求再加一些邮票的信封。
He used an envelope to send a package.
他用一个信封寄送了一个包裹。
She kept all her letters in envelopes.
她把所有的信都放在了信封里。