ETF的显著特征包括：内在的流动性、节税、资产净值无持续的溢价或折价，这些特征将稍后讨论。
Distinguishable features of ETFs include their underlying liquidity, tax efficiency, and lack of persistent premiums or discounts to their net asset values (NAV), which are discussed next.
研究了泡沫金属的机械阻尼性能，表明泡沫金属是一种具有高能量吸收特性的轻质高阻尼材料，其阻尼特征表现为与应变振幅密切相关，而与应变频率无显著关系的非线性内耗。
The mechanical damping properties of metallic foams has been studied in the paper. It is found that metallic foams is a light high-damping material with great energy absorbing characteristics.
血清VEGF的表达与肝癌强化特征、包膜完整性均有较显著性差异（P<0.05），与肝癌的大小无显著性差异（P>0.05）；
The expression of the serum VEGF in HCC was significantly elevated as compared to the enhancement features and capsule(P<0.05), While no correlation with the size of HCC(P>0.05);
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