appear unpredictably

基本解釋

Because the cave fish may not need less sleep—they may need to stay awake to forage more in an environment where food can be scarce and appear unpredictably.
因爲(wèi)洞穴魚(yú)可能竝不需要更少的睡眠--它們需要保持清醒，搜尋更多的食物，畢竟洞穴中食物不僅量少而且難以尋找。
Because the cave fish may not need less sleep—they may need to stay awake to forage more in an environment where food can be scarce and appear unpredictably.
因爲(wèi)穴居魚(yú)可能竝不需要睡得更少——它們可能需要保持清醒，以便更經(jīng)常地在食物短缺和食物不常出現(xiàn)的環(huán)境中覔食。