Strap-on carrier rocket is a kind of complex space structure.

捆绑式火箭结构是一种复杂的航天结构。

youdao

Wednesday's flight will use an Ariane 44L rocket equipped with four liquid strap-on boosters, the most powerful version of the Ariane-4 series.

CNN: Ariane to launch radio satellite for Africa

The Ariane 44L rocket equipped with four liquid strap-on boosters -- the most powerful in the Ariane-4 series -- lifted off at 7:16 p.m. local time (2216 GMT) from the European Space Agency (ESA) launch center in Kourou, on the northeast coast of South America.

CNN: Ariane rocket orbits U.S. communications satellites