他的解释中没有一丝真相。
There isn't a ___grain of truth in his explanation.
她的论点包含一丝智慧,但大部分是有缺陷的。
Her argument contains a ___grain of wisdom, but it's mostly flawed.
即使在他的道歉中,也没有一丝诚意。
Even in his apology, there was not a ___grain of sincerity.