1. Please call me back at your convenience. ���㷽���ʱ��ظ��绰���ҡ�
2. I treat the one near the train station more like a giant convenience store. ��վ�Ա��Ǽҳ��ж�����˵������һ�����͵ı����ꡣ
3. The convenience of this from the viewpoint of structural engineering is of course obvious. �ӽṹ���̵Ĺ۵���˵��������ʽ�ķ�����Ȼ�Ǻ����Եġ�
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n.
1. the state of being suitable or opportune
2. the quality of being useful and convenient
3. a toilet that is available to the public
4. a device or control that is very useful for a particular job