-s'
suffix
forming the possessive of plural nouns ending in the sound s or z and of some singular nouns
⇒ 
girls'
⇒ 
for goodness' sake
| 词汇 | -s' | 
| 词根词缀 | Collins -s' suffixforming the possessive of plural nouns ending in the sound s or z and of some singular nouns ⇒  girls' ⇒  for goodness' sake | 
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