定点取样：增加了观测的精确性及可以被记录的行为。
Point sampling Increase the accuracy of observation and number of behaviors that can be recorded.
定点取样：在一个团体中一次仅有一个个体的行为被记录。
Point sampling The behavior of just one individual in a group at a time is recorded.
定点取样：可能会忽略他人的一些对于理解个体行为具有重要的意义的行为。
Point sampling May miss behavior in others that is important for an understanding of individual.
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