我有点想通了。我认为这与Google Api的请求限制有关。
我通过在每次迭代中重新初始化翻译器API来解决此问题：
import copy
from googletrans import Translator
translatedList = []
for index, row in df.iterrows():
# REINITIALIZE THE API
translator = Translator()
newrow = copy.deepcopy(row)
try:
# translate the 'text' column
translated = translator.translate(row['text'], dest='en')
newrow['translated'] = translated.text
except Exception as e:
print(str(e))
continue
translatedList.append(newrow)
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