Note that the inv function USES SPL nested lists to represent matrices, as there is no matrix type in SPL.
请注意，inv函数使用SPL嵌套列表来表示矩阵，因为SPL中没有矩阵类型。
In strengthening of Baitukeng Reservoir, the dam slope was paved with composite geomembrane, while the dam foundation was paved with plastic film inv.
在白土坑水库加固中，坝坡铺设复合土工膜，坝基进行垂直铺塑并将两者连为一体。
Objective To analyse the risk factors of the postoperative iris neovascularization(INV) of proliferative diabetic retinopathy(PDR) patients treated by vitreoretinal surgeries.
目的探讨增殖型糖尿病视网膜病变（PDR）行玻璃体手术后，虹膜红变（INV）发生的危险因素。
Objective To analyse the risk factors of the postoperative iris neovascularization(INV) of proliferative diabetic retinopathy(PDR) patients treated by vitreoretinal surgeries.
目的探讨增殖型糖尿病视网膜病变（PDR）行玻璃体手术后，虹膜红变（INV）发生的危险因素。
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