Can I put "the" before "long-term trends"? If I put "the", how the meaning will change?
Remember that "the" is often used to specify specific or particular things. The speaker is talking about "long-term" trends in general, so it isn't necessary to use an article here. If you wanted to use "the," you would need to specify the type of long-term trend, for example. Ex: Climate scientists are interested in studying long-term trends. Ex: Climate scientists are interested in studying the long-term trends of plant species facing extinction.
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