名词
中文翻译：初级曲轴
同义词：
['primary shaft', "primary gearbox shaft例句：1. The engine's primary crankshaft is responsible for driving the pistons.（发动机的初级曲轴负责驱动活塞。）2. The design of the primary crankshaft is crucial to the performance of the engine.（初级曲轴的设计对发动机的性能至关重要。）"]
例句：
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1. The engine's primary crankshaft is responsible for driving the pistons.
发动机的初级曲轴负责驱动活塞。
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2. The design of the primary crankshaft is crucial to the performance of the engine.
初级曲轴的设计对发动机的性能至关重要。
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3. The primary crankshaft is made of high-quality steel and has a smooth operation.
初级曲轴由优质钢材制成，运行平稳。