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overpopulated adj.人口过多的=
densely-populated——
sparsely-populated/ sparsely-peopled
populous adj.人口众多的（正式）
-The subway here is ~ with people , so I decided to switch for the next one.
Population n.人口数量
-What’s the ~ in your country?
-The city has a ~ of two million.
-Our dear motherland is faced with a major problem that is ~ explosion.
sheer adj.1） 纯粹的，不掺杂的
pure unmixed
by sheer chance纯属偶然
sheer happiness纯粹的幸福
When you come to think about it, there are only four ways you can deal with rubbish: dump it, burn it, turn it into something you can use again, attempt to produce less of it. We keep trying all four methods, but he sheer volume of rubbish we produce worldwide threatens to overwhelm us.
Rubbish, however, is only part of the problem of polluting our planet.The need to produce everincreasing quantities of cheap food leads to a different kind of pollution.
不定式作定语：
修饰n.或prep.通常置于其后，作后置定语
