1．“not...until...”的强调句式
...but it was not until 1938 that the first colour TV programme was broadcast.
【仿写】 直到所有人到齐了， 他才宣布了那个消息。
It was not until all the people arrived that he announced the news.
2．It takes sb.some time to do...花费某人……(时间)做……
It took more than two decades, though, until 1951, for regular colour TV broadcasts to begin in the USA.
【仿写】 他花了三个小时才做完那个实验。
It took him three hours to do the experiment.
