Paul davies , eric pearse . success in english teaching [ m ] . shanghai : shanghai foreign language education press , 2002 安平.新课程理念与初中英语课程改革[ m ] .沈阳:东北师范大学出版社, 2002
2.
" they are known to limit sea grass and kelp production and consequently the diversity and complexity in communities supported by these producers , " pearse said “我们知道，它们会限制海藻产量进而影响到由海藻支持的那些区域的差异性和复杂性。 ”
3.
" sea urchins are the main prey of many top predators ? including crabs , lobsters , fish , and sea otters ? that directly limit their abundance , comparable to how coyotes , hawks , and owls limit the abundance of rabbits , " pearse said “海胆是很多高级掠食者的主要食物，包括螃蟹、龙虾、鱼和海獭，它们直接决定着海胆的数量，正如野狗、鹰、猫头鹰决定着兔子的数量。 ”
