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[00:12.77]gratuitous adj.无理由的
[00:17.96]Her gratuitous performance is not expected by the producer
[00:23.63]source n.来源，源头(beginning origin)
[00:27.92]account n.原因
[00:31.96]On no account can we ignore the value of knowledge
[00:36.19]reason n.原因 v.推论(deduce)
[00:40.55]sake n.缘故 原因(reason)
[00:45.14]He would do anything for money's sake
[00:49.28]cause vt.导致 n.原因(reason)
[00:53.63]The heavy rain was the cause of the flood
[00:58.34]impute vt.归咎于(ascribe,attribute)
[01:02.53]I impute his failure to laziness
[01:07.08]attribute vt.归因于(accredit ascribe)
[01:11.46]The discovery of electricity is attributed to Benjamin Franklin.