sills
n.
窗台（板）( sill的名词复数 );
门槛;
侵入火成岩席;
平巷底;
例句:
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The micro - gabbro phase is indentical with the typical Bulawayan dolerite sills.
微辉长岩相与标准的布拉瓦约粒玄岩床相同.
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Eventually he was happy that the sills and doors were a reasonably good fit.
门槛和门扇算是贴合良好，他终于开心了。
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Sharply outlined dikes, sills and bosses occur in numbers.
边界清楚的岩脉, 岩床及岩瘤等都常见.
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Below, Mr. Sills talks about design and the risk of overdecorating.
来自WSJ
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In 1929, Beverley Sills, U.S. operatic soprano renowned for her role in "La Traviata, " born.
来自CNN
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Roosting pigeons favour window sills and roof ledges but can be discouraged by installing thin spikes which are widely available.
来自BBC