lacuna
n.空白；空隙；腔隙；缺陷
网络解释.空白；腔隙；地层缺失；醉后一夜
词形变化:
复数：lacunae
派生词: lacunal lacunary lacunate lacunose
opening
双语例句
1. 1 . Reasons of forming first cracks were foundry lacuna, impurity gathering, lard exiting.
铸造缺陷 、 杂质元素偏聚和夹杂物的存在是形成早期裂纹源的原因.
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