＜今日の進捗＞Book7 - 59 (What does fickle mean?).
＜オリジナル回答＞What does it mean when a person is said to have a highly volatile personality?When a person is said to have a highly volatile personality, it means that the person is short tempered.
What do we mean when we say that petrol is a highly volatile substance?When we say that petrol is a highly volatile substance, we mean that petrol is easy to evaporate.
What kind of behavior can kill a relationship?Breaking a promise is a behavior which can kill a relationship.
Are there any moody people among your friends? What are they like?There are some moody people among my friends. They are very temperamental and often get angry or excited.
＜単語・イディオム＞get moody :
イライラする
moodily :
ふさぎこんで、不機嫌に
mood swings :
気持ちの揺れ、感情の起伏
volatile :
（人・性質など）気の変わりやすい、移り気の、気まぐれな
volatile personality :
カッとなりやすい性格、気分が変わりやすい性格
volatile substance :
揮発性物質
fickle:
変わりやすい、気まぐれな、移り気の、飽きっぽい
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