In many Canadian families, children contribute next to nothing to the operation of the household.
在许多加拿大人的家庭，孩子几乎从不参与家务劳动。
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Holds that household heat metering requires heating quality to be highly enhanced which in turn needs good design, high level operation management and satisfactory construction and installation.
Through a survey this paper holds that the large household pattern of agricultural operation is the ideal path for the Second Leap in the Chinese agriculture.