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1·In theory I'm on call day and night.

理论上，我不分昼夜随叫随到。《柯林斯英汉双解大词典》

2·In theory, these machines should last for ten years or more.

从理论上讲，这些机器应能用十年以上。《牛津词典》

3·In theory, the buyer could ask the seller to have a test carried out.

在理论上，买方可以要求卖方进行一次产品检测。《柯林斯英汉双解大词典》

4·Achieving these goals is relatively easy in theory, yet quite difficult in practice.

实现这些目标从理论上说比较容易，但在实践上却相当困难。《柯林斯英汉双解大词典》

5·In theory, a girl may veto the spouse her parents have chosen.

理论上，女孩可以不接受她父母已为自己选择的配偶。

6·In the internet age, at least in theory, this fraction can be much reduced.

在互联网时代，至少在理论上，这个比例可以大大降低。

7·In theory, at least, the problem is that there are very many choices to make.

至少在理论上，问题在于我们要做太多选择。

8·In theory, interactive advertising can engage viewers in a way that 30-second spots do not.

理论上，交互式广告能够以一种30秒广告做不到的方式来吸引观众。

9·Pupils attend the school in their own neighbourhood, which in theory removes ranking by school.

学生们在自己的社区上学，这在理论上解决了学校排名的问题。

10·In theory, says Valentijn, this can create a high enough temperature to generate superheated steam.

瓦伦坦泰因说，理论上，这可以创造一个足够高的温度来产生过热蒸汽。