限制饮食和放松身心是保持健康的两个要诀。Diet and relaxation are two important keys to good health.住房条件差、家庭压力大会影响身心两方面的健康。Poor housing and family stress can affect both physical and mental health.长途飞行后，你可能会感到身心疲惫。You may be physically and me...
在这风云变色的几年间, 北京陷落了.As the difficult years passed , Peking fell.分别探讨了接插件镀金和镀银层变色的原因.The causes of tarnishing gold and silver - plated connectors were studied respectively.我养了一只四脚蛇, 变色的时候很有趣.I am raising a lizard, it is int...