fiddle back figure

例句：

1. 1. The car's engine is designed with a fiddle back figure to improve efficiency.
   这辆车的引擎设计有曲柄后部形状，以提高效率。
2. 2. The artist used a fiddle back figure to create the intricate details on the painting.
   艺术家使用曲柄后部形状来创作这幅画上的复杂细节。
3. 3. The engineer analyzed the data using a fiddle back figure to identify any potential issues.
   工程师使用曲柄后部形状分析数据，以识别任何潜在问题。