Researchers are projecting a westward expansion of " Cactoblastis cactorum" in North America.

研究人员计划在北美向西扩展“仙人掌螟疫病菌”。

Thousands have migrated westward to seek a better life, particularly as the expansion of the European Union has allowed them to take advantage of freedom-of-movement rules.

为了寻求更好的生活，数千名吉普赛人已经向西迁移。尤其是欧盟的扩张，可以让他们利用扩张中的自由迁徙规则。