Question

じゃこしらす

一番最初の文の文構造が分かりません。isが述語だと思うのですが、主語はどれですか？common factorが主語だとするとWhat is common factor～?にはなりませんか？

日本語訳: 地震被災者の捜索救助技術、誘導ミサイル用の通信システム、そして新しいコンピュータ設計に見られる共通要素は何だろうか？

L 夢
Uses for Fiber Optics
techniques for
What common factor is to be found in search and rescue
earthquake victims, communication systems for missiles, and ne
Computer designs? These are all examples of the rapidly growing
number of applications for fiberoptic technology. Fiber optics - using
light transmitted through glass or plastic fibers for communications -
has been around since the late 1950's, but only in the past few years h
the technology come into its own. The actual methods of operation
rather simple. Electric signals are converted into light pulses, and a lF
Source is used to send a signal down an optical fiber.

Answer 1

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Dεακγ

主語は、What common factor です。
この英文は肯定文にwhatを入れて成り立つ疑問文です。
What makes you happy?とかもwhatが主語ですよね。

じゃこしらす

分かりやすい説明、ありがとうございます！