pains
noun [ plural ] uk/peɪnz/ us/peɪnz/
be at pains to do something 尽心竭力，花大力气做…
to try very hard to do something
She is at pains to point out how much work she has done. 她极力表白她做了的工作是那么多。
go to/take great pains to do something 不辞劳苦做…
to make a lot of effort to do something
I went to great pains to select the best staff available. 我煞费苦心地从现有人员里挑选最好的员工。