1.Long before Marco Polo’s tales inspired European explorers£¬ merchants and explorers had set sail from east to west. The Silk Road across the sea was evenextended to the Indian Ocean apart from the overland route. There£¬ merchants met to negotiate trade deals. In the Ming Dynasty£¬ Zheng He set sail to the east coast of Africa. African royal families sent gifts in return for silk and spices. Although China withdrew from further expeditions later£¬ these sea routes remained active channels. The historic Silk Road now helps to strengthen the political£¬ economic and cultural bonds between China and other countries. With the latest technology in hand£¬ China is reaching out across the sea far into the future.

2.Some people argue that exploring the sea is not exploiting it. However£¬ some countries are still "murdering" intelligent marine creatures like whales without mercy according to media coverage. The sea is home to life£¬ not human beings’possessions. All of us in anyprofession should protect it. Meanwhile£¬ some opponents applaud sea exploration£¬ believing that to understand it is to better protect it.