在《PONS词典》中的词汇
ˈmain·spring bar·rel 名词 (watches, clocks)
ˈmain·spring 名词
1. mainspring (in clock, watch):
2. mainspring 引 (motivating factor):
-  the mainspring of sb's success
-  
I. bar·rel [ˈbærəl, 美 also ˈber-] 名词
2. barrel (measure for beer and oil):
4. barrel:
| I | barrel | 
|---|---|
| you | barrel | 
| he/she/it | barrels | 
| we | barrel | 
| you | barrel | 
| they | barrel | 
| I | barrelled / 美 barreled | 
|---|---|
| you | barrelled / 美 barreled | 
| he/she/it | barrelled / 美 barreled | 
| we | barrelled / 美 barreled | 
| you | barrelled / 美 barreled | 
| they | barrelled / 美 barreled | 
| I | have | barrelled / 美 barreled | 
|---|---|---|
| you | have | barrelled / 美 barreled | 
| he/she/it | has | barrelled / 美 barreled | 
| we | have | barrelled / 美 barreled | 
| you | have | barrelled / 美 barreled | 
| they | have | barrelled / 美 barreled | 
| I | had | barrelled / 美 barreled | 
|---|---|---|
| you | had | barrelled / 美 barreled | 
| he/she/it | had | barrelled / 美 barreled | 
| we | had | barrelled / 美 barreled | 
| you | had | barrelled / 美 barreled | 
| they | had | barrelled / 美 barreled | 
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