下面的内容就是tpo43口语答案及解析资料task4，为了帮助同学们顺利备考
T4
材料要点重现：教授提到有两种不同因素会影响生物种群数量，一种是生物的，如捕食者与猎物的关系，讲座中列举了大量猫头鹰捕食老鼠，导致老鼠数量下降的例子;另一种是非生物的，如天气、阳光等，讲座中列举了冬季缩短导致兔子繁殖周期缩短，因此兔子繁殖数量增加的例子。
高分词汇：presented, predator-prey cycle, treat as, experience
范文：In the lecture, the professor mainly talked about two different types of factors that can bring about population changes. The professor presented two examples to explain the biotic and abiotic factors in his speech. The first factor is called biotic, like the predator-prey cycle. For instance, the population of mice varies with the owl’s population since owls treat mice as their prey. If one year there are more owls than usual, then the number of mice would drop. Because there are more owls to eat the mice. The second one is called abiotic, like the weather. For example, the rabbits usually start having their young at the end of winter. And they keep reproducing until the following winter. But if this year will be a short winter season, then the rabbits can start reproducing much earlier than longer winter season. This means the rabbits will experience at least one extra reproductive cycle, so the rabbit’s population would increase.
And that's the two factors the speaker presented in this lecture.