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找到 252 张相关图片

birdwatchers on a deck observe birds using binoculars and cameras

birdwatchers on a deck observe birds using binoculars and cameras

标签: birdwatchers,on,a,deck,observe 浏览: 18
using a spotting scope researchers stufy the behavior of wild birds

using a spotting scope researchers stufy the behavior of wild birds

标签: using,a,spotting,scope,researc 浏览: 15
students attending course and practice using a surveyor rod for mapping profiles of various habitat features

students attending course and practice using a surveyor rod for mapping profiles of various habitat features

标签: students,attending,course,and, 浏览: 18
service employee using a leaf blower to clear a path

service employee using a leaf blower to clear a path

标签: service,employee,using,a,leaf, 浏览: 12
personnel using controlled fire

personnel using controlled fire

标签: personnel,using,controlled,fir 浏览: 12
visitors using a spotting scope from a blind to view their favorite birds

visitors using a spotting scope from a blind to view their favorite birds

标签: visitors,using,a,spotting,scop 浏览: 15
two employees using pickup truck to put boat into water at boat ramp

two employees using pickup truck to put boat into water at boat ramp

标签: two,employees,using,pickup,tru 浏览: 22
teacher using suitcase for survival teaching kit

teacher using suitcase for survival teaching kit

标签: teacher,using,suitcase,for,sur 浏览: 17
teacher using paper bag and scales to weigh captured bird

teacher using paper bag and scales to weigh captured bird

标签: teacher,using,paper,bag,and,sc 浏览: 16
person practice using a sight level for mapping ground

person practice using a sight level for mapping ground

标签: person,practice,using,a,sight, 浏览: 15
caribou using antlers

caribou using antlers

标签: caribou,using,antlers 浏览: 13
micrograph reveals a meningeal infection due to bacillus anthracis bacteria using an h e stain

micrograph reveals a meningeal infection due to bacillus anthracis bacteria using an h e stain

标签: micrograph,reveals,a,meningeal 浏览: 15
bacillus anthracis positive encapsulation test is demonstrated using two different agar media

bacillus anthracis positive encapsulation test is demonstrated using two different agar media

标签: bacillus,anthracis,positive,en 浏览: 15
using a trichrome stain trophozoite of the single celled parasite entamoeba histolytica

using a trichrome stain trophozoite of the single celled parasite entamoeba histolytica

标签: using,a,trichrome,stain,tropho 浏览: 17
mycobacterium tuberculosis using fluorescent auramine with acridine orange counterstain

mycobacterium tuberculosis using fluorescent auramine with acridine orange counterstain

标签: mycobacterium,tuberculosis,usi 浏览: 15

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