信封的英语的读法/ˈenvələʊp/。
一、美式读法
美/ˈenvəloʊp/
二、复数
envelopes
三、词典
1，信封：a flat paper container used for sending letters in
2，塑料封套；塑料封皮：a flat container made of plastic for keeping papers in
四、英英释义
1，any wrapper or covering
2，a flat (usually rectangular) container for a letter, thin package, etc.
3，the bag containing the gas in a balloon
4，the maximum operating capability of a system (especially an aircraft)
5，a natural covering (as by a fluid)
6，a curve that is tangent to each of a family of curves
五、例句
1，I put 'please forward' on the envelope.
我在信封上写了“请转递”。
2，The address must be clearly visible through the window of the envelope.
从信封的透明窗必须能够看清楚地址。
3，Please enclose a stamped addressed envelope to get your test results.
请附姓名地址邮资俱全的信封，以便把化验结果寄给你。
4，He slit open the envelope and took out the letter.
他拆开信封，抽出信来。
5，Make sure you've signed the cheque before sealing the envelope.
一定要在支票上签了名再封信封。