What is a environment in a system development. In a system development we use a word of environment. We call it env for short often. Kinds of a env are production, staging, development usually.Env is a group of servers, programs and data. …

look into ... = research fundamental = basic

Plannning a sysmem release We planned a sysmem release in production environment. We recognized that members of our division and another had many tasks to release a system in production environment.

up to 任せる。責任を持ってもらう ※「（組織上の）上位者に任せる、投げる」といったニュアンス in months, in years 何か月もの間、何年もの間

I made estimates. I made estimates.One of them is very easy but another is so difficult. I read many source codes and think about a new fuction. I have not read many source code in months like this.

Meeting with a customer We had a meeting with a customer about a contract for a system maintenance. two estimates I wrote two estimates and sent them to a customer.