The eerie silence here is only broken in spring. 这里静得可怕 只有到春天才会热闹起来
means that desert elephants can only refill their tanks once every four or five days. 意味着沙漠里的大象 只能每隔四五天喝饱一回
It's an event that only happens once or twice a year at the most. 而且一年最多也只发生1~2次
But birds are not the only animals to benefit from the presence of the cacti. 不过鸟并非唯一从仙人掌那里 获得好处的动物
so this slender strip of desert is virtually the only part of the Atacama where life can exist. 因此这个狭长地带实际上是 阿塔卡马沙漠中唯一的生命绿洲
so it's only now that you can judge just how much life there can be in the desert. 所以只有此时你才能判断 沙漠中究竟有多少生物
It's only now that they can leave shelter. 所以只有到了晚上它们才能离开庇护所
so it's only the tops that are moving. 所以沙丘移动的部分只是顶部