The challenge is catching them. 难点在于如何捕捉

96. desalinating the water,
    将水淡化
97. and in the process,
    在这个过程中
98. making themselves into perfect little water bottles for lizards.
    将自己变成蜥蜴的完美小水瓶
99. The challenge is catching them.
    难点在于如何捕捉
100. Finally.
     终于吃到了
101. But just when it thinks it's cracked it,
     但就在它以为问题已经解决时
102. trouble on the horizon.
     麻烦出现了

来自《我们星球上的生命 第一季 第四集 Life on Our Planet S01E04 冷血动物》第 99 行