[误] They came to her sickbed and found her looking yellow.

[正] They came to her sickbed and found her looking pale and unwell.

注：显然，这句话如果直译外国人多半不懂，因为他们的肤色与我们的不同。所以应该直接把虚弱和病态表达出来，而不拘泥于原文。