Even an avalanche of light power can be dangerous, but the Peruvian catastrophe was particularly terrible because it was caused by a heavy layer of ice.

即使是光能的雪崩也可能是危险的，但秘鲁的灾难尤其可怕，因为它是由厚厚的冰层造成的。

But the shift in its relative position vis a vis the rising nations of Asia, particularly China, will tighten the constraints on the exercise of its power.

然而，与日益兴起的亚洲国家(尤其是中国)相比，美国相对地位的改变将使其在行使权力时更受克制。

Buyers and consultants, however, remain doubtful that many travel programs will adopt a non-capped, dynamically priced program this year, particularly with buyers in the power seat.

然而，购买者和旅游咨询顾问，尤其是占主导地位的买家一方，对于今年将有许多差旅计划采用无上限的动态定价模式持怀疑态度。