パッシブソナーでしょう
passhibusonādeshō
1. Probably passive sonar.
Noun
#161218
1. Probably passive sonar.
1. it seems; I think
2. right?; don't you agree?
1. sonar
1. passive
1. passive sonar
1. passive solar
1. active sonar
1. passive matrix display
1. passive house (ultra-low energy building standard)
1. passive smoking