Non-cognitivism is an important theory of Meta-Ethics, Ayer’s Emotivism is the most innovational and typical and earliest idea of Non-cognitivism in 20th.

非认是元伦理学中的重要理论问题，艾耶尔的情感理论则是20世纪非认最早，但也是最具创新性和代性的重要观点。

Under the phase-contract microscope, cell multi-l ayer was shown to be a refractile sheet, which means the capacities of biomateri al to attract cell and maintain the cell attachment.

相差显微镜下复层现为折光 带，这反映生物材料引导贴附并保持贴附的能力。