由于家畜备受虐待，其中许多宁愿选择投生为野生动物，尽管动物在野外不得不承受诸多挑战。
Because of abuse of domestic animals, many of them prefer and choose to incarnate as wild animals in spite of the challenges that animals in the wild have to endure.
还有那冥思的音乐对技术有极大的挑战，一开始格拉斯先生为寻找合适的演奏者颇费了一番周折。人们听着这音乐，仿佛置身于一片平静浩瀚而又神秘的大海之中。
And the meditative music, which is so technically challenging that Mr Glass originally had trouble finding performers for it, washes over listeners, as coolly vast and mysterious as the sea itself.
在一封电子邮件通讯中，Atrap的导师，美国哈佛大学Gerald Gabrielse博士，称反氢的产生为“重要的和挑战性的”里程碑，而他的团体也同样认为。
In ane-mail message, Atrap's leader, Dr. Gerald Gabrielse of Harvard, called the production of antihydrogen an "important and challenging" milestone, adding that his group had seen similar signals.
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