将中文翻译成中文

本文研究了从胡萝卜素中得到天然胡萝卜素β-胡萝卜素（β-carotence）的提取、分离纯化及测定。（1）确定了以石油醚为溶剂来提取胡萝卜素。用 98%石油醚在室温下，提取4h的提取条件。特别讨论了提取时间对总β-胡萝卜素得率的影响，并对各种提取方法进行比较。（2）研究了用三氧二铝、硅胶层析柱分离纯化胡萝卜素提取液的工艺条件。虽然没有得到最佳的分离纯化工艺条件，但是在此过程中加强了对天然胡萝卜素成分的分离和精致理解。同时也学到了许多操作技巧。（3）用紫外分光光度计对提取液进行分离，观察分离效果，确定波峰。（4）用气相色谱更好确定提取液所含的成分。

为正确起见本人翻译出两种：
We studied the natural carotene has been β - carotene (β -carotence) Extraction,Purification and determination.(1) to determine the petroleum ether as a solvent to extract carotene.98% at room temperature using petroleum ether extract 4h extraction.Extraction time to discuss the total β - carotene yield of the impact of various extraction methods.(2) to study the use of three oxygen alumina, silica gel column chromatography purification process conditions carotene extract.Although not the best conditions for separation and purification.However, in the process, enhance the separation and refinement of the understanding of natural carotene content.Also learned many techniques.(3) extract