where·to /-ˌtu/
(ad.)何以,向何處,為什?
Where·to adv.
1. To which; -- used relatively. “Whereto we have already attained.”
Whereto all bonds do tie me day by day. --Shak.
2. To what; to what end; -- used interrogatively.
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whereto
adv 1: to or unto which [syn: whereunto]
2: to which; "the species whereto this name might be better
applied"
3: to what place, purpose, or end