Create a .env file in the backend/ directory:
\nThere have long been hints that innate immunity can last longer in certain circumstances. The most-studied example is the Bacillus Calmette-Guerin tuberculosis vaccine, which is given to some 100 million newborns every year. Epidemiological and clinical studies have shown that it can decrease infant mortality from other infections, suggesting that the cross-protection could last months. But the phenomenon was inconsistent and the mechanism mysterious.，更多细节参见whatsapp
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Go to technology，这一点在wps中也有详细论述
Ранее официальный представитель Кремля Дмитрий Песков оценил вероятность встречи президента России Владимира Путина с президентом Ирана Масудом Пезешкианом. Он добавил, что контакты с иранским руководством не прекращаются.