Underpinning
n. 基礎(chǔ)材料, 支承結(jié)構(gòu)
? 同義詞
??? 情景例句
Will it take long?
要很久嗎？
Fishing is often frustrating.
釣魚常常會(huì)遭到挫敗。
since ground stations and satellites cannot see everywhere.
因?yàn)榈孛婀ぷ髡竞托l(wèi)星不可能看到地球上的每一個(gè)地方。