名词
中文翻译：活塞内肋
同义词：
['inner piston', 'inner rib', 'inner cylinder liner']
例句：
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1. The engine's piston is made of high-quality steel to ensure smooth operation.
发动机的活塞由高质量的钢材制成，以确保平稳运行。
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2. The piston inner rib helps to distribute the load evenly across the cylinder walls.
活塞内肋有助于将负载均匀地分布在气缸壁上。
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3. During the compression stroke, the piston moves up and down, causing the inner ribs to move in and out.
在压缩行程中，活塞上下运动，导致内肋进出气缸。