themselves made relatively easy nowadays by modern means of transport
现在有了现代交通工具，他们就相对容易了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements—themselves made relatively easy nowadays by modern means of transport.
由于人口的猛增或大量人口流动（现代交通工具使这种流动相对容易）造成的种种问题也会对社会造成新的压力。
Additional social stresses may also occur because of the population explosion problems arising from mass migration movements—themselves made relatively easy nowadays by modern means of transport.
由于人口的猛增或大量人口流动（现代交通工具使大量人口流动变得相对容易）所造成的种种问题也会增加社会压力。
Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements themselves made relatively easy nowadays by modern means of transport.
译文：人口的猛增，或者大量的人口流动如今，现代交通手段使得这种流动相对容易起来产生的问题也会对社会造成新的压力。
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