an acute angleの例文

• an acute angle , a right angle , an obtuse angle , a straight angle .
  鋭角 直角 鈍角 平角
• the sword-guard is large and angular , and the shitao (string ) is longer than that of an ordinary sword; the sheath is matted so that it does not glitter when light reflects off its surface , and the tip of the sheath is made of metal , and forms an acute angle .
  鍔は大き目で角張っており、下緒は普通の刀のものより長く、鞘は光を反射して目立たないように艶消しに仕上げられ、先端の鐺（こじり）は金属製で鋭角に仕上げられている。