To make this code executable, I must add the gram and lb methods to numbers by opening the Numeric class, as shown in Listing 2

要使此代码可执行，我必须通过打开 Numeric 类以便将 gram 和 lb 方法添加到数字中，如清单 2 所示

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In Listing 2, I reopen the Numeric class (which handles both fixed and floating-point Numbers) to add the gram and pound methods.

在清单2中，我重新打开了numeric类(其处理固定和浮点数字)以便添加gram和pound方法。

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Rails provides reasonable definitions of blank? For several other objects too: true, false, empty arrays or hashes, numeric types, and even the object class.

Rails同时为许多其他对象提供了合理的blank ？定义：true, false，空数组及哈希表，数值类型，甚至是Object类本身。

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