空封即空白封。
...技术新颖白光数码管的研究-职称论文发表网|文发网 关键词:空封; 折射系数; 增透膜; 白光LED [gap=1008]Keywords: empty envelope; refraction coefficient; anti-reflection film; white light LED ..
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称其为“空envelope”是为了强调在通过“投递”发出它之前，它最终应该包含一封“信”(也许是商业信)。
You call it an "empty envelope" to emphasize that it should eventually contain a "letter" (perhaps a business letter) before you can send it by "post".
从几张洗衣收据，废纸篓中的一封未完成的信，一个空的威士忌酒瓶，以及其他各类线索中，斯坦贝克拼凑出寂寞哈利的形象。
From some laundry receipts, an unfinished letter in the wastebasket, an empty bourbon bottle, and other assorted clues, Steinbeck pieced together a portrait of Lonesome Harry.
在转换至封隔器装置上面的环空以前，回流的携带液在工具底部进入内部流动通道，于是将环空隔离。
The returned carrier fluid enters the internal flow path at the base of the tool before crossing over to the annulus above the packer assembly, isolating the annulus.
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