如何在google translate API中放置数字占位符？

from google.cloud import translate_v2 as translate

def translate_text(text):
    # 实例化Translate客户端
    client = translate.Client()

    # 定义源语言和目标语言
    source_language = 'en'
    target_language = 'zh-CN'

    # 将数字占位符标记添加到源文本中
    text_with_placeholder = text.replace('123', '{number}')

    # 调用Translate API进行翻译
    translation = client.translate(
        text_with_placeholder,
        source_language=source_language,
        target_language=target_language
    )

    # 获取翻译结果
    translated_text = translation['translatedText']

    # 将数字占位符标记替换回原始数字
    translated_text = translated_text.replace('{number}', '123')

    return translated_text

# 调用翻译函数并打印结果
text_to_translate = 'There are 123 apples.'
translated_text = translate_text(text_to_translate)
print(translated_text)