shard       
noun [ C ] uk/ʃɑːd/ us/ʃɑːrd/
 (玻璃杯、茶杯、容器或类似物品的)碎片
a piece of a broken glass, cup, container, or similar object
  Shards of glass have been cemented into the top of the wall to stop people climbing over. 墙头上用水泥粘着玻璃碎片,以防止人们翻墙过去。 
 Synonym: fragment