数字分类精简词库，测验支持 0-亿 随机出题

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

LearnEnglish/LearnEnglish/Resources/words.json

@@ -147,6 +147,7 @@
       "name": "数字",
       "icon": "number",
       "words": [
+        { "word": "zero", "phonetic": "/ˈzɪroʊ/", "meaning": "零", "example": "Zero means nothing.", "exampleMeaning": "零表示没有。" },
         { "word": "one", "phonetic": "/wʌn/", "meaning": "一", "example": "I have one book.", "exampleMeaning": "我有一本书。" },
         { "word": "two", "phonetic": "/tuː/", "meaning": "二", "example": "Two birds are singing.", "exampleMeaning": "两只鸟在唱歌。" },
         { "word": "three", "phonetic": "/θriː/", "meaning": "三", "example": "Three cats are sleeping.", "exampleMeaning": "三只猫在睡觉。" },
@@ -174,7 +175,13 @@
         { "word": "seventy", "phonetic": "/ˈsevnti/", "meaning": "七十", "example": "My grandmother is seventy.", "exampleMeaning": "我奶奶七十岁。" },
         { "word": "eighty", "phonetic": "/ˈeɪti/", "meaning": "八十", "example": "He can count to eighty.", "exampleMeaning": "他能数到八十。" },
         { "word": "ninety", "phonetic": "/ˈnaɪnti/", "meaning": "九十", "example": "The book has ninety pages.", "exampleMeaning": "这本书有九十页。" },
-        { "word": "hundred", "phonetic": "/ˈhʌndrəd/", "meaning": "百", "example": "One hundred people came.", "exampleMeaning": "来了一百个人。" }
+        { "word": "hundred", "phonetic": "/ˈhʌndrəd/", "meaning": "百", "example": "One hundred people came.", "exampleMeaning": "来了一百个人。" },
+        { "word": "thousand", "phonetic": "/ˈθaʊznd/", "meaning": "千", "example": "This library has thousands of books.", "exampleMeaning": "这个图书馆有数千本书。" },
+        { "word": "ten thousand", "phonetic": "/ten ˈθaʊznd/", "meaning": "一万", "example": "Ten thousand people ran in the race.", "exampleMeaning": "一万人参加了赛跑。" },
+        { "word": "hundred thousand", "phonetic": "/ˈhʌndrəd ˈθaʊznd/", "meaning": "十万", "example": "The house is worth two hundred thousand dollars.", "exampleMeaning": "这房子价值二十万美元。" },
+        { "word": "million", "phonetic": "/ˈmɪljən/", "meaning": "百万", "example": "The city has a population of one million.", "exampleMeaning": "这个城市有一百万人口。" },
+        { "word": "ten million", "phonetic": "/ten ˈmɪljən/", "meaning": "千万", "example": "Ten million viewers watched the show.", "exampleMeaning": "一千万观众看了这个节目。" },
+        { "word": "hundred million", "phonetic": "/ˈhʌndrəd ˈmɪljən/", "meaning": "亿", "example": "Over a hundred million people speak Japanese.", "exampleMeaning": "超过一亿人说日语。" }
       ]
     },
     {