The body is built from balsa wood, and the wings powered by a wire crank driven by a rubber band.

燕尾蝶的身体是用轻木做的，而翅膀的动力来源为用橡皮圈驱动的金属曲柄。

youdao

It was he who folded aluminium, made ceramic sculpture in Japan, created delicate pieces in balsa wood.

是他对铝进行折叠处理，在日本制作陶瓷雕塑，用巴沙木制作精美物件。

youdao

Built from carbon fibres and balsa wood, Snowbird has a wing span of 32m (105 feet) - comparable to a Boeing 737.

雪鸟是由碳纤维和轻质木制成的，机翼长总32米(105英尺)，堪比波音737。

youdao

When David Lowy was 5 years old, his mother bought him a toy glider made from balsa wood.

FORBES: Magazine Article

Kon-Tiki was the name of the balsa wood raft which was used to cross the Pacific Ocean in 1947 in a journey of 8, 000km (4, 900 miles).

BBC: Floating ferret rescued off Anglesey's Beaumaris Pier

Each one is handbuilt out of sheets of lightweight balsa wood sandwiched between layers of carbon fiber or Kevlar and baked in an oven at 100C for stiffness.

FORBES: Mine's Lighter