mainspring
US /ˈmenˌsprɪŋ/
・UK /ˈmeɪnsprɪŋ/
C2 高級
n.名詞大發條；主要的動機或原因
He replaced the mainspring in the vintage watch.
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勞力士 Daytona 的傳奇歷史！ | Bob's Watches (The History of the Rolex Daytona | Bob's Watches)
- By reconfiguring its sub-dials, moving the hour and minute chronograph counters to the 3 and 6 o'clock positions, its gear train became a touch less complex, meaning a larger mainspring barrel with a power reserve of 72 hours could be fitted.
透過重新配置副面盤，將時、分計時盤移至 3 點鐘和 6 點鐘位置，其齒輪系統變得稍微不那麼複雜，這意味著可以裝配更大的發條盒，提供 72 小時的動力儲存。