艰辛 (jiān xīn): arduous, tough

In order to send their two children to university, this farmer couple went to the fields before dawn every day and endured hardships beyond what most people can imagine.

In the early days of starting his business, he single-handedly went to markets and looked for investors, enduring great hardships, but he never thought of giving up.

Braving wind and snow, the climbers finally reached the summit after more than ten hours of arduous trekking.

This scientist worked in a crude laboratory for thirty years and overcame countless hardships before achieving today's success.

Recalling the hard days when she worked part-time while studying, she cherishes her current life even more.