weak birefringence

例句：

1. 1. The crystals exhibit weakbirefringence due to their uniquestructure.
   这些晶体由于其独特的结构表现出弱双折射。
2. 2. The microscope is used toobserve the weak birefringence ofbiological tissues.
   显微镜被用来观察生物组织的弱双折射现象。
3. 3. The oil has aweak birefringence that makes itdifficult to distinguish between light and dark areas.
   这种油具有弱双折射特性，使得难以区分光暗区域。