Later systems had radially mounted shoes to provide more stable contact through lever action. 後面的系統放射狀設置集電靴通過槓桿作用來提供穩定接觸。
Because of the Financial Lever,the liability could bring along both Financial Lever Income and Financial Lever Loss. 負債資本受財務槓桿作用，既可能帶來財務槓桿收益，又可能發生財務槓桿損失。
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