Objective:To study the relation between expression of vascular endothelial growth factorD (VEGF-D) and lymphatic metastasis in hypopharyngeal carcinoma.
目的：研究血管内皮因子D（VEGF-D）在下咽癌组织中的表达及其与淋巴结转移的关系。
2
Lack of vitamin D is another factor to consider.
缺乏维生素D是另一个需要考虑的因素。
《柯林斯英汉双解大词典》
3
She said that the use of sun creams and moisturisers with a sun protection factor also reduces UV absorption and so vitamin D production.