adjective [原级] 大量的,价值巨大的;牢固的,结实的;基本的,实质性的;(饭菜)丰盛的;重要的,真实的;有地位的,富有的
A substantial number of mothers with young children are deterred from undertaking paid work because they lack access to childcare. 很多有小孩的母亲找不到人照顾小孩,从而无法从事有薪工作。
noun [物质名词] 重要材料
The present situation has witnessed a substantial improvement in progress. 当前局势已经取得了实质性的进展。