This book is termed an “easy reader,” but in truth, it is poetry. Lobel’s introduction to his beloved woodland pair, whose ...

科学家在火星上发现的不同寻常的岩石中包含了这颗红色行星上可能曾有生命存在过的证据。这些岩石是由美国国家航空航天局的 “毅力” 号火星车在一处布满灰尘的河床上发现的，岩石上有引人注目的纹路。科学家们认为这些纹路可能含有一些矿物质，产生这些矿物质的化学反应或与远古火星微 ...

Abstract: Underwater fishing net recognition plays an indispensable role in applications such as safe navigation of unmanned underwater vehicles, protection of marine ecology and marine ranching.