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Answer: We believe the sentence is best completed this way:

“Each motorcycle engine in the test blocks was revved up till a sound like the wrenching of steel plate reverberated off the walls of the testing facility.”

Many are the ways to describe the screeching, keening sound of a small engine being operated at high rpm, usually for short duration. When bolted to a test block, an engine is pushed to its outer limits of operation by engineers who are quite ready to let it fly apart if it cannot withstand the stresses. The writer compares the sound of an engine in extreme distress to the sharp, shuddering sound that erupts when a sheet of steel is violently twisted apart. The metallurgical comparison is effective because it doesn’t ask a reader to leave the shop in his mind for a comparable sound found in nature. Ranging too far afield for descriptions can cause a reader to stumble.
小型引擎以高轉速操作時（通常持續時間較短），會發出尖銳刺耳的聲音，這聲音有很多描述方法。工程師把引擎用螺栓固定到試驗塊上後，會發動引擎並推到最高速限，如果引擎受不了壓力，就會飛散開來。文中把承受極端壓力的引擎發出的聲音，比擬為鋼片猛力撕扯開來時，爆出的尖刺聲響。以金屬來比喻效果良好，因為讀者的想像力不必轉到引擎部門以外，設想另一個自然的聲響。描述若離主題太遠，讀者不易理解。