Doors of hollow core, even when locked, are vulnerable to break-ins.
空心门，即便锁上了，也易遭贼侵入。
The physical core is crystallized in magnetic iron-nickel alloy-composite. The core is not hollow.
物质核心是磁性铁镍合金复合材料的结晶，其核心不是中空的。
The physical core is crystallized in magnetic iron-nickel alloy-composite. The core is not hollow.
物质核心是磁性铁镍合金复合材料的结晶，其核心不是中空的。
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