Daily Vocabulary(2017/07/30)

20201.be traced back to(～までさかのぼる）
The concept later embodied in the U.S. Constitution can be traced back to this charter.
20202.sign up(登録している）
I've signed up as a volunteer with a tutoring group that helps schoolchildren with their homework.
20203.bone up(力を入れる）
I have to bone up on my physics.
20204.tutoring group(個別指導）
The tutoring group is sounds like a great idea.
20205.as best one can(出来るかぎり）
I help kids understand their homework assignment, answer their questions as best I can.

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