41. It is difficult to translate in English, 42. Some of the most difficult conflicts on the face of the planet, 43. Or, your child can make their own lists of common, popular, difficult and new words. 44. They are more difficult to breed and have a longer gestation period . 45. It is difficult to estimate this output with any degree of precision . 46. But the effect of other mutations like PKU seem more difficult to control . 47. It is much more difficult to judge oneself than to judge others . 48. Because we want this to be difficult, and I'll tell you why momentarily. 49. Making sniffable substances smell nasty is difficult . 50. Lagaan is too difficult a proposition to emulate .
