xīn kǔ
辛辛苦苦
xīnxīn kǔkǔ
painstakingly; laboriously; with great hardship
他起早贪黑地工作，非常辛苦。
tā qǐzǎo tānhēi de gōngzuò, fēicháng xīnkǔ.
He works from dawn to dusk, it's very hard work.
这事儿还得您辛苦一趟。
zhè shìr hái děi nín xīnkǔ yī tàng.
I'll have to trouble you to make this trip.