各级

[gè jí]

all levels

at all levels

各级[gèjí]-allordifferentlevels:

partyorganizationsatdifferentlevels;各级党组织

leadingorganizationsatalllevels;各级领导机关

制造多级火箭的一种方法是把各级火箭并排放在底部。
One of the ways to make step rockets is to put the stages side by side at the bottom.

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