坚硬的

At times, his work brings to mind Dutch artists of the past, such as Hieronymus Bosch and Pieter Breughel the Elder.

有时候，他的作品会让人想到过去的荷兰艺术大师，如鲍希和布勒哲尔。

Some of these provide tilth to a soil .

有些有机肥是用来改善土壤的耕性的。