CONTENTS 1
1．The Sea and How We Explain Its Mysteries 1
2．What Happened Earlier 10
3．Mapping the Ocean Floor 26
4．The Wonders of Sea Water 33
5．The Moving Waters 43
6．Minerals and Other Supplies of the Sea 56
7．The Life in the Sea 63
8．Tomorrow's Promise 75
Vocabulary 82
地名与海流名称 89
潜水器与舰船名称 90
人名表 91
机构名称 92