心脏病是40岁以上妇女死亡的首要原因，尤其是绝经后的妇女。
Heart disease is the leading cause of death in women over 40 years old, especially after menopause.
此外，有希望的但是未经证实的结果可能泄露出来，尤其是当结果涉及到希格斯玻色子——“上帝粒子”时，这可是LHC著名的首要目标。
Moreover, promising but unconfirmed results are likely to leak—particularly if they concern the Higgs boson, the LHC's famous first target.
金工实习中需要注意的首要问题就是安全，尤其是车工实习的安全。
The most important thing is the safety in metalworking practices that everyone should pay attention to, especially the safety in lathe work practices.
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