我向保安员出示了通行证，他挥手让我通过。
I showed my pass to the security guard and he waved me through.
我们的太阳系中的行星不是那些可以通过理论预测其组成的普通行星，而是独特的个体，它们的化学和构造特征都是由它们创造的。
Instead of normal planets whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were create.
哨兵不让没有通行证的人通过大门。
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