聴導犬: hearing dog (a dog trained to assist the deaf)

not necessary to; don't have to

Expresses gratitude or relief for something that happened in the past, a choice made, etc.

If only ~

It's good / okay to... / is fine

degrees / occurrence / time / counter for occurrences

time; whenever

time

(geometry) degree of an angle / degree in temperature, scale, and so on / number of times / percentage of alcohol concentration

recently, this time