英语语法分析

So, it's a penta — what we call a pentatonic scale.

因此，它是一个所谓的，五，我们称之为五声的音阶。

The detection concept for large diameter beam parallelism with penta prism is introduced.

介绍了用五棱镜法检测大口径光束平行度的原理。

The two flame retardants tested – penta and octa PBDE – have been banned in the United States since 2006.

被测试的两种阻燃剂材料-五溴联苯醚（penta-PBDE）和八溴二苯醚（octa-PBDE）-自2006年起已在美国被禁用。