但在加拿大与英国的防区，前线不设防。
But in the Canadian and British sectors, the frontier is unguarded.
但在加拿大、阿根廷和澳大利亚猪群中发现。
But it has been found in herds in Canada, Argentina and Australia.
感恩节虽然是美国人民独创的一个古老节日，但在加拿大也是一个全国性节日。
Thanksgiving Day is an traditional holiday which was created by Americans, but it is also a national holiday in Canada.
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