pearl                    
noun uk/pɜːl/ us/pɝːl/
 [ C or U ]珍珠 
a small, round object, usually white, that forms around a grain of sand inside the shell of a sea creature, especially an oyster. Pearls are valuable and are used to make jewellery.
  a string of pearls 一串珍珠 
 a pearl necklace 珍珠项链 
 pearls[ plural ] 珍珠首饰
jewellery made from pearls
  He gave her pearls for her birthday. 他送给她珍珠首饰作为生日礼物。 
 You never saw her without her pearls - even on the beach!
 Pearls are a safe bet for wearing with a little black dress.
 She was dressed in a cashmere sweater and pearls.
 She sat in front of the mirror and fastened her pearls around her neck.
  [ C ]人造珍珠 
an artificially made pearl
  cultured pearls 养殖的珍珠 
  [ C ] literary液态珠状物 
a small drop of liquid
  There were pearls of dew on the grass. 草地上有点点露珠。 
  [ U ]珠灰色,银白色 
the white shiny colour of pearl or a pale colour
  [ U ]珍珠母(同 mother-of-pearl) 
→  mother-of-pearl 
  pearl buttons 珍珠母纽扣 
 Idiom   
a pearl of great priceidiom UK formal 珍贵罕见之物
something that is very rare and is considered very important
  Inexhaustible patience is a pearl of great price. 无尽的耐心是难能可贵的。