这种机械出片率低，而且费力。

This piece of the low rate of mechanical, and laborious.

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通常女性很善于同时处理多项任务，而且看起来似乎完全不费力。

Often women are so good at multitasking that it appears it's all effortless.

《柯林斯英汉双解大词典》

处理 这种油泥般的资源非常费力，而且释放的温室气体也要比传统的原油开采多得多。

Processing the sludge-like crude takes an enormous effort and releases much more greenhouse gases than conventional crude-oil production.

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