The lock is activated by a magnetic key.
这个锁用磁性钥匙开。
The key is using magnetic and electric fields, instead of matter, to construct the walls of an antimatter "bottle."
这套设备的关键之处在于使用了电磁场的而不是普通物质来捕捉反粒子，电磁场犹如一道墙，把反物质牢牢地束缚在“电磁瓶”内。
Scientists believe magnetic structures, like sunspots hold an important key to understanding space weather.
科学家认为磁性结构如太阳黑子对理解空间天气有重要帮助。
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