The old man was a trader in tea.那老头曾是茶商.As a trader, he had taken clients regularly to Del Frisco's, a steakhouse in Midtown Manhattan.作为一名交易员, 他经常在曼哈顿中城的牛排餐厅DelFrisco's招待自己的客户.Where the trustor gives special p...
Royal-watcher Mary Hayes said: "It looks like it is going to be an unhappy time for the Queen."皇室观察员玛丽·海斯说:“看来女王接下来的日子不太好过。”Always aim for achievement and forget about success. - --- Helen Hayes.永远要争取做出成就,别多考虑成功. ---- 海伦...
氨基酸是弱酸和弱碱, 因此, 它们是很好的缓冲剂.Amino acids are weak acids and weak bases, therefore, they are excellent buffering agents.缓冲剂可以像烤面包的苏打粉那样使用,它们都能够使ph值保持稳定.Buffers can be used like baking soda will help keep ph stable.着重叙述了缓冲剂原理及...