banana clip  
noun [ C ] uk/bəˈnɑː.nə ˌklɪp/ us/bəˈnæn.ə ˌklɪp/
  (FOR HAIR)      
  香蕉(发)夹
a large clip (= an object for fastening things together or holding them in position) for hair, usually made of plastic, that has two long curved parts with teeth (= rows of points) held together at one or both ends with a hinge (= a part that allows it to open and close)
  She secured her mass of curls at the nape of her neck with a blue banana clip. 她用蓝色香蕉夹将一头卷发固定在颈背上。 
 Compare: alligator clipbutterfly cliphair claw
 - More examples
 - Loose hair can look too casual, so add a rhinestone banana clip.
 - Banana clips are back and they can be used to create so many hairstyles.
 - The show brought out the same nostalgic childish glee as I feel when I find an old banana clip for my hair.
 
  (FOR GUN)      
 香蕉形弹夹
a gun clip (= a container for holding bullets that can be fastened to a gun) that has a curved shape like a banana
  The assault rifle has a banana clip and is able to fire off several rounds quite quickly. 突击步枪有一个香蕉弹夹,可以快速发射数发子弹。 
 - More examples
 - He wore an ammunition vest stuffed with extra banana clips.
 - There is no reason why any civilian should own an AK-47 with a hundred-round banana clip.