intransitive. To make use of a valve or valves; spec. in ballooning, to open a valve in order to descend.
| 单词 | θ207407 |
| 释义 | society > travel > air or space travel > ballooning > balloon [verb (intransitive)] > specific operations (2) valve1906 intransitive. To make use of a valve or valves; spec. in ballooning, to open a valve in order to descend. sandbag1928 intransitive. To attend to sandbags. |
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