Force consequently requires solicitation from without: it works blindly: and on account of this defectiveness of form, the content is also limited and accidental.

因此，力需要外在的诱导，它是盲目地起作用，而且由于这样的缺乏形式，所以内容也是受限制的、偶然的。

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The longer the policy is in force, the greater the proportion of the premium that goes into a cash value account that works like an IRA or 401(k) plan.

FORBES: Estate Tax Insurance