名词
中文翻译：一级
同义词：
['first order A-V block', 'primary A-V block例句：1. The first degree A-V block is a crucial component in the electrical circuitry.（一级A-V阻断是电路中至关重要的组成部分。）']
例句：
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1. The first degree A-V block is a crucial component in the electrical circuitry.
一级A-V阻断是电路中至关重要的组成部分。
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2.The engineer designed the first degree A-V block to improve efficiency.
工程师设计了一级A-V阻断，以提高效率。
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3.During the testing phase, the first degree A-V block was tested for functionality.
在测试阶段，一级A-V阻断被用来测试其功能。