Noun:

1. a handsaw with a long narrow blade for cutting short radius curves; similar to a compass saw

keyholen.钥匙孔；（篮球）罚球区adj.内幕的；偷偷打听的keyhole report秘闻, 内幕新闻keyhole urchin钥孔海胆keyhole surgery锁眼切口手术keyhole profile孔形貌keyhole caliper键孔卡尺Keyhole approach锁孔入路keyhole specimen钥匙孔形切口试样,冲击弯曲试验钥匙孔试样keyhole channels匙孔信道keyhole reporter报导内幕的记者keyhole operation锁孔手术

1. A segment of the box corner was removed with a hole saw in order to permit an examination of the crack.
   为了对裂纹进行检查，用圆孔锯从箱型断面拐角处锯下一部分。