为了确保可信性他付出了艰辛的努力。
我们与中国的合作是六年前开始的，之前我们双方都为此付出了艰辛的努力。
Our relations with China began 6 years ago, after a great deal of hard work on both sides.
这幅图画生动地描绘了一个男孩在沿着跑道奔跑。他付出了艰辛的努力，汗水淌下脸庞。
It is vividly depicted in the cartoon that a boy is running along the racetrack with painstaking efforts, sweat pouring down his face.
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