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propellant
[只用于to and fro一词组中] wǎng
fro [frəʊ] ADV
fro
fro
fro
huí
to and fro
来回地 láihuíde
to and fro
往复地 wǎngfùde
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Examples from the PONS Dictionary (editorially verified)
Monolingual examples (not verified by PONS Editors)
This also meant teachers were split between the three sites, traveling to and fro to teach at different locations in the same day.
en.wikipedia.org
This allows the swing to be pulled to and fro with salvage attached.
en.wikipedia.org
Sometimes they were loaded aboard rail cars and driven to and fro.
en.wikipedia.org
Big engines will dig big ditches, and thousands of people will be running to and fro.
en.wikipedia.org
Contact with home was limited, and the restless travelling to and fro ceased altogether.
en.wikipedia.org