Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]

Aerial photo taken on Oct. 16, 2020 shows farm machineries harvesting in a rice field in northeast China's Heilongjiang province. The province of Heilongjiang, known as China's "grain barn", is in harvest season. [Xinhua/Wang Jianwei]