regrettable
adj
that is or should be regretted 令人痛惜的; 令人遗憾的; 可悲的; 不幸的
regrettable failures, losses, mistakes, etc 令人惋惜的失败、 损失、 错误等
Her rudeness was most/highly regrettable. 她粗俗无礼, 令人遗憾.
Yes, I see. How can they get rid of waste water in this way? What a terrible colour the sea is now! It looks as if our class won't be able to bathe at all.
是的,我看见了。他们怎么能这样排放废水呢?海水的颜色多么可怕呀!看来我们班同学根本不能在这里游泳。
They then knew that they had discovered the cause of the fire.
这时调查人员知道他们找到了发生火灾的原因了。
I see. Maybe there are some things among your aunt's papers, like Clare' school reports, old photographs, and so on.