记忆因子又叫“钙尔贝”特殊记忆物质，它是存在于人脑“记忆中枢”中的一种化学物质。这种物质一般情况下不轻易释放，只有在非同寻常的时刻（如身历险境、惊心动魄的场合，以及反复多次记忆强化累积形成联想）才释放，犹如“密码”永久性地存入人脑记忆中枢，使人终身难忘。 Memory factor, also known as “calcium erbium” special memory substance, it is present in the human brain “memory center” in a chemical substance. This material is not easily released under ordinary circumstances and only released at unusual moments (such as experiencing dangerous situations, thrilling situations, and repeatedly accumulating memories to form associations), as if the “password” was deposited permanently Brain memory center, people never forget.