I bought shares in British Gas when it was privatized.我在英国煤气公司私营化时买了它的股票。Training a dog requires the expenditure of time and effort.训练一条狗需化时间和精力。Last week, in the heat of the election campaign, the Prime Minister left for America.上周，当竞选活动进行到白热化时，首相启程去了美国。