他没有设置任何特殊的记号在房子上，而是非常仔细的检查和观察他，凭借房子旁边的信息，他不可能再弄错了。
He did not set any particular mark on the house, but examined and observed it so carefully, by passing often by it, that it was impossible for him to mistake it.
没有其他明显种类的事物，可能会引起这样的记号。
There's no obvious sort of other thing that could cause this.
没有任何记号。
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