TASK DEFINITION: In this task, you are given a sentence in the Japanese language and your task is to convert it into the English language. In translation, keep numbers as it is and make it sentence case (capitalize only the first word of each sentence and noun).
PROBLEM: どちらの場合も、氷（どのジェット燃料の中にも通常は存在する水からできたもの）の蓄積が燃料／オイル熱交換器と呼ばれる構成部分で進んでいた。

SOLUTION: In both cases a build-up of ice (from water normally present in all jet fuel) developed on a component called the fuel/oil heat exchanger.

PROBLEM: 「獣医師の証言は調査の重要な部分だ」

SOLUTION: "Statements by veterinary surgeons are a significant part of the investigation." 

PROBLEM: 「我々はまだ、この洞窟で靴や他の物が何であったのかや、この洞窟の目的を知らない」とピナシは語り、「我々はこの洞窟の裏に子どもたちの墓があることを知っているが、この時代についてはあまりに知られておらず、我々はこれらの様々な物が一緒に見つかる理由について何一つ確かなことが言えない」と言った。

SOLUTION:
"We do not know yet what the shoe or other objects were doing in the cave or what the purpose of the cave was," said Pinhasi, "We know that there are children's graves at the back of the cave but so little is known about this period that we cannot say with any certainty why all these different objects were found together".