an envelope of 的用法This is an envelope of gasses around the planet请问汉语意思!

an envelope of 的用法This is an envelope of gasses around the planet请问汉语意思! an envelope of 有没有表观的意思？ back-of-an-envelope怎么翻译? envelope的用法词组也可以啊 An envelope 什么意思 back-of-the-envelope envelope of the pulse how is an envelope 改正错误 an amount of与amount of 的用法与区别? envelope的意思 envelope的读音 envelope的意思 envelope的复数 an increasing number of用法 in an envelope along with a letter,一个e开头的单词,这是什么单词啊 There was an envelope lying___the floor.用适当的介词填空 邮件中的附件用appendix 还是enclosure?enclosure :something put in an envelope with a letter 信件中的附件appendix:a part at the end of a book containing esp additional information 书末的附录个人认为用enclosure , envelope locker tails 的意思