For Donna Molnar and her family in Ancaster, Canada, Christmas is a time of joy compromised by tragedy.
对居住在加拿大斯特的唐纳·莫尔纳一家来说，圣诞节的欢乐总会被悲剧气氛笼罩。
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One of the volunteer search and rescue team, Ray Lau, was in a field near a farmers' market on the edge of Ancaster, a small town about 45 miles west of Toronto.