TASK DEFINITION: In this task, you are given a sentence in the English language and your task is to convert it into the Japanese language. In translation, keep numbers as it is and make it sentence case (capitalize only the first word of each sentence and noun).
PROBLEM: Twitter says it will use the new feature only "when required to do so in response to what we believe to be a valid and applicable legal request."

SOLUTION: ツイッターは、「我々が有効かつ適応可能な正当な要請であると信じたものへの対応の中で必要に迫られた時」のみにこの新機能を用いると語る。

PROBLEM: The opposition party has organised numerous demonstrations and rallies, and over 1,000 of their members being arrested.

SOLUTION: 野党は、数えきれないほどのデモや集会を計画し、1,000人を越えるメンバーが逮捕された。

PROBLEM: They did not draw any conclusion as to why such movement was observed.

SOLUTION:
彼らは、なぜそのような動きが観察されたのかという理由に関して、いかなる結論も出さなかった。