我们刚开始学微积分的时候可能会感觉到困难重重。
We may run into heavy weather when we learn calculus at first.
在涉及到新加坡内政的写作时，外国作家与种种出版刊物(包括已发生的这件事)经常感觉困难重重。
Foreign writers and publications, including this one, have often found themselves in trouble when writing about Singapore's internal affairs.
然而，她注意到，通过卫星获取二氧化硫的准确读数是困难的。二氧化硫在贴近地面的低空区含量最为丰富，由此，卫星探测就显得困难重重。
However, she cautions that it is difficult to capture accurate readings of sulfur dioxide from the satellites due to difficulties detecting the gas low to the ground, where it is most abundant.
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