Occurrence of recent nannoplankton in surface sediments at M1_MULT243, Arabia...
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r=rare f=few c=common a=abundant -=no occurrence
r=稀有的(rare),f=少量的(few),c=常见的(common),a=丰富的(abundant),-=无出现(no occurrence)

r=rare f=few c=common a=abundant -=no occurrence
r=稀有的(rare),f=少量的(few),c=常见的(common),a=丰富的(abundant),-=无出现(no occurrence)