旅游资源保护问题已经成为近期旅游界的一个热点。
The issue on tourism environment is a hot topic in tourism recently.
随着锰在影像学和实验研究中的不断应用，其毒性损伤已经成为近期人们研究的热点。
As the manganese has been applied continually in the imaging studies and experimental researches, its toxic injury has been a hotspot.
Q F环的研究已成为近期国际代数学界研究的热点。
Now the study of QF rings has been a hotspot in international algebraic world.
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