英语翻译“艰难”英语怎么说

艰难 [jian1 nan2]
difficult
hardwork
参考例句
针对一位受人欢迎的在职者的艰难竞选
An uphill election campaign against a popular incumBent.
飞行员艰难地使飞机着陆
The pilot set the plane down hard.
火车艰难地向山坡上行驶.
The train labored up the hill.
拖拉机艰难地向山坡上爬去.
The tractor laboured up the hillside.
他分配给我一项艰难的工作.
He assigned me a hard job.
艰难的时候方能显出忠诚.
Loyalty shines out in time of woe.
那架飞机艰难地朝机场飞去.
The plane limped toward the airfield.
在矮树林中艰难前行
worked through the underbrush.