Words & Phrases 18

◆that wasn't very heavy and not very large
thatはwarheadを先行詞とする関係代名詞。

◆and being miniaturized, would give the missile a greater length and

trajectory.”
being（miniaturized）は動名詞でwould giveの主語となっている。
trajectory＝軌道、弾道、軌跡

◆"The question now is, however, whether this test was a one-off
or whether it marked the beginning
one-off¬ ＝ 一度きりのこと
whether〜or… ＝ 〜かそれとも…なのか

◆of a concerted and more determined effort
concerted effort ＝ あらゆる努力、ものすごい努力

◆to try and overcome some of the problems
effortsを修飾する形容詞用法の不定詞。

◆that obviously they have encountered."
thatはproblemsを先行詞とする関係代名詞。