Their appeals for an end to the violence had a hollow ring.

他们要求停止使用暴力的呼吁并无诚意。

《牛津词典》

According to the factors of operation pressure, medium and temperature, the specification and outside dimension of hollow metal O-ring, the detailed dimension of sealing groove were determined.

设计时应根据操作压力、介质和温度等条件确定金属空心o形圈的外形尺寸和规格，然后进行矩形槽的设计。

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The dust valve cancels a rubber plate on the existing valve plate, but USES a hollow rubber ring. The regulating screw is used to regulate the dip Angle of the valve plate.

该卸灰阀取消了现有阀板上的橡胶板，而用空心橡胶圈，并用调整螺丝调整阀板倾角。

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Those words tend to ring hollow after such a frustrating run of results.

BBC: Winless Wales still pack punch

But such promises are beginning to ring hollow.

ECONOMIST: Turkey

As UN-imposed sanctions bite deeper, and even Iran's middle classes struggle to make ends meet, the triumphalism of Iran's conservatives is likely to ring increasingly hollow.

ECONOMIST: Ayatollah Ali Khamenei is bolstered