| 释义 |
Definition of pneumatic tube in English: pneumatic tubenoun historical A tube used for conveying letters, parcels, etc., in pneumatic dispatch.
Origin Mid 19th century; earliest use found in The Times. Definition of pneumatic tube in US English: pneumatic tubenoun historical A tube used for conveying letters, parcels, etc., in pneumatic dispatch.
Origin Mid 19th century; earliest use found in The Times. |