记得大学毕业时，我们班同学纷纷找机会留在大城市或者出国，可是有个男生却毅然决然回到自己的家乡就业。我们问他为什么，他说自己的学历和能力回家乡肯定能受到重用，可是留在大城市里就显不出来了，因为这里人才扎堆，竞争太激烈。他的这种心态 ...

Whale sharks are the world's largest fish; the longest ever recorded was over 13 metres. They are harmless filter feeders that suck in plankton and small fish. These distinctively yellow-spotted ...