A--Handle With Care
B--Admission By Ticket Only
C--Camera Forbidden
D--Children Not Admitted
E--Keep Right
F--Keep Right
G--Information Desk
H--No Admittance
I--Night-Service Window
J--Stand Clear Of The High-volt Electricity
K--The Sales Section Stops Here
L--On Sale Or Return
M--Garment Design Center
N--Please Don’t Touch The Exhibits
O--Parking Place
( )包退包换 ( )禁止入内

At sea, as on land, humans have now positioned themselves on the top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea. There is a simple reason for this. Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil and meat. Even so, they might not be so vulnerable to human depredation if they did not, like humans, reproduce so slowly. Every year humans take more than 50 million tons of fish from the oceans without critically depleting the population of any species. But the slow-breeding mammals of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.