You should start by doing the edges first. Let's look for pieces with straight edges like this one.
The trick is to fill in the pieces from the outside first. You need to find the pieces that have a straight edge.
ーYou should start by doing the edges first. Let's look for pieces with straight edges like this one.
「まず端から始めた方がいいよ。これみたいなまっすぐなのを探そう。」
start by doing the edges first で「まず端から始める」
look for で「探す」
pieces with straight edges で「端がまっすぐなピース」
ーThe trick is to fill in the pieces from the outside first. You need to find all the pieces that have straight edges.
「コツはまず外側から埋めること。端がまっすぐなピースを全部見つけないと。」
The trick is to ... で「コツは…すること」
fill in で「埋める」
pieces that have straight edges で「端がまっすぐなピース」
ご参考まで！
カナダ 
