nutritional resources的用法和樣例：
例句
- Thus many temperate-zone birds use the increasing day lengths in spring as a cue to begin the nesting cycle, because this is a point when adequate food resources will be assured.
所以許多生活在溫帶地區的鳥(niǎo)類(lèi)把春天里逐漸變長(cháng)的日照長(cháng)度當作開(kāi)始筑巢的提示，因為這是能保主充足的食物來(lái)源的時(shí)候。
