北美莺最喜欢的猎物云杉芽虫的数量一直在下降。
The population of the spruce budworm, the warbler's favorite prey in North America, has been dropping.
第一眼瞥去，这些蛾也长得完全一样，Miller说这个抽屉内仅有一种云杉蚜虫——北美洲东面树林内一类不知名的害虫。
The moths also look the same at first glance, and Miller says this drawer holds nothing but a single species of spruce budworm, an infamous pest of eastern forests in North America.
尽管北美短叶松的气孔对轻度干旱胁迫不如黑云杉敏感，但是它对中度及严重干旱胁迫的敏感程度却高于黑云杉。
Despite less sensitive to mild drought stress in jack pine than in black spruce, stomata was more sensitive to moderate and severe stress in jack pine than in black spruce.
尽管北美短叶松的气孔对轻度干旱胁迫不如黑云杉敏感，但是它对中度及严重干旱胁迫的敏感程度却高于黑云杉。
Despite less sensitive to mild drought stress in jack pine than in black spruce, stomata was more sensitive to moderate and severe stress in jack pine than in black spruce.
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