This is a challenging task to achieve, but the long term payoff can be tremendous.
这是一个极具挑战性的任务，但是长期回报是巨大的。
This will be a prolonged task, but we expect to achieve noticeable results this year.
但是今年要取得突出的或者说比较显着的成绩。
A "challenge" has to be something that is difficult to achieve otherwise it is just a "task".
一项“挑战”只有具备一定难度才可被称为“挑战”，否则充其量仅为一项“任务”。
A "challenge" has to be something that is difficult to achieve otherwise it is just a "task".
一项“挑战”只有具备一定难度才可被称为“挑战”，否则充其量仅为一项“任务”。
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