A rainbow appears in the sky above Singapore's Marina Bay, on Aug. 24, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

An oriental whip snake is seen at Singapore's Old Upper Thomson Road on Oct. 22, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

Visitors observe social distancing as they wait to feed a giraffe in the Singapore Zoo on July 6, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

Vessels are seen at the Straits of Singapore on March 13, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

A Hawksbill sea turtle hatchling makes its way towards the open sea at the turtle hatchery in Singapore's Sisters' Islands Marine Park on Aug. 23, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

People appreciate the Christmas light decorations on a road in Singapore on Dec. 16, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

Smooth-coated otters appear in Singapore Botanic Gardens in Singapore, Nov. 18, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

The moon rises in the sky during Mid-Autumn Festival at Gardens by the Bay in Singapore, Oct. 1, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

Sunset glow is seen over the Marina Bay in Singapore, on Aug. 24, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

Fireworks explode during the Marina Bay Singapore Countdown 2020 in Marina Bay, Singapore, on Jan. 1, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

A woman takes photos of festive lanterns lit up for the upcoming Mid-Autumn Festival at the Chinatown of Singapore, Sept. 29, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

A cyclist cycles up a road on Mount Faber in Singapore, on June 17, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

A rainbow appears over the Singapore Botanic Gardens in Singapore on Sept. 30, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)

A jogger runs around Singapore's Marina Bay on April 25, 2020. Singapore is known as a garden city for its lush greenery and neatness. (Photo by Then Chih Wey/Xinhua)