He should never buy a stock because it has gone up or sell one because it has gone down.
他决不应该因某一股票已经上涨就买入，或是因某一股票已经下跌就抛出。
It is reported that unemployment rate in this city has gone up again.
据报道这个城市的失业率又上升了。
And if you change the rating, it means that the risk level has gone up.
如果改变评级的话，那是意味着美国的偿还债务的风险增加了。
And if you change the rating, it means that the risk level has gone up.
如果改变评级的话，那是意味着美国的偿还债务的风险增加了。
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