Before the 19th-century invention of portland cement, masons used thin joints of lime mortar, which required greater precision than the thicker joints of portland-cement mortar and were not as strong.
在19世纪普通水泥发明之前，泥瓦匠使用石灰砂浆薄黏片，这种黏片比普通水泥砂浆的厚片更要求精确，但不是很坚固。
The masons are calling for mortar.
泥瓦匠正需要灰泥。
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