Up last is support for Co- and Contra-Variance.
最后就是对协变和逆变的支持了。
Rule Six: Don’t sign up for a sequel without your original co-star.
规则六：不要在你的老搭档不在的情况下接一部续集。
CO: Thank you. You may lock up your suitcase. Here are your passports.
官员：谢谢。你可以将行李锁上了。护照还给你们。
Before you do that you need to set-up a co-ordinate system.
在做这些之前你需要先建立一个坐标系。
Rule Six: Don't sign up for a sequel without your original co-star.
规则六：不要在你的老搭档不在的情况下接一部续集。
Rule Six: Don't sign up for a sequel without your original co-star.
规则六：不要在你的老搭档不在的情况下接一部续集。
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