They were tested in three ways, using a single baited string, two parallel strings where only one was baited, and two crossed strings where only one was baited.
实验用三种方式展开：一条系着诱饵的绳子，两条平行的绳子其中一条上有饵，和两条交叉的绳子其中一条上有饵。
They were tested in three ways, using a single baited string, two parallel strings where only one was baited, and two crossed strings where only one was baited.
实验用三种方式展开：一条系着诱饵的绳子，两条平行的绳子其中一条上有饵，和两条交叉的绳子其中一条上有饵。
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