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.
一种完井部件。它通常包括在接近封隔器的下部组合中。它用来提供在油管与环空之间的连通。
A completion component, generally included in the lower assembly near the packer, that allows communication between the tubing and annulus.
在尾管内下封隔器，循环确信尾管环空畅通后下入水泥承留器固井。
The liner was cemented by cementing retainer after its annular was assured expedite by setting packer in liner and making circulation.
本文介绍了空冷135MW汽轮发电机定子线圈的成型及封焊模具的设计。通过对线圈自身成型模的改进，可以同时在成型模上进行引线封焊。
This paper introduces the design of the mould for shaping and sealing braze of copper bars used in stator coils of 135mw aircooled turbogenerator.
本文介绍了空冷135MW汽轮发电机定子线圈的成型及封焊模具的设计。通过对线圈自身成型模的改进，可以同时在成型模上进行引线封焊。
This paper introduces the design of the mould for shaping and sealing braze of copper bars used in stator coils of 135mw aircooled turbogenerator.
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