Well, Foreign Minister Sergey Lavrov said yesterday that these countries could also expect a tit for tat for these expulsions.

俄罗斯外交部长谢尔盖·拉夫罗夫昨天表示，俄罗斯也会对这些国家的驱逐行动进行对等报复。

Iran has impounded a British tanker in what is seen as a tit for tat move. Bethany Bell is in Vienna.

伊朗也扣押了一艘英国油轮，此举被视为以牙还牙。以下是贝瑟尼·贝尔在维也纳的报道。

But I think what's troubling here is that it's the latest in a tit for tat that has been going on for more than a year.

不过我认为令人不安的是，这种报复行动已经持续了一年多的时间。

Dr.Wild and Dr.Aplin suspect the trendsetters are older birds, and that evolution favors younger ones copying their elders since those elders have evidently survived what fortune has to throw at a tit.

威尔德博士和阿普林博士怀疑，引领潮流的是较为年长的鸟类，由于生物学的进化，幼小的鸟类倾向于模仿它们的长辈，因为这些长辈显然命运捉弄下的幸存者。