开始学习

先看原句

Though they are useful for detecting shifts in the number and variety of species in an area, a new Stanford study has found that this type of record is not perfect.

先不要急着逐词翻译，先感受一下：你会不会读到后面开始乱。

重点拆解

第一步：先找真正主干

a new Stanford study has found

很多人会被前面的 Though they are useful... 吸引，但真正重要的信息，其实是后面的研究发现。

结构拆解

第二步：区分主干和补充信息

让步信息

Though they are useful for detecting shifts in the number and variety of species in an area

真正主干

a new Stanford study has found

研究结论

that this type of record is not perfect

英语长句里，并不是每部分都同样重要。

小测试

这句话真正想表达的重点是什么？

Though they are useful for detecting shifts in the number and variety of species in an area, a new Stanford study has found that this type of record is not perfect.

这些记录很有用 研究发现这种记录并不完美 物种数量发生了变化

总结

这一句你已经看懂了

很多长难句的问题，不是单词太难，而是读的时候没有区分：哪些是背景，哪些才是真正重点。