パッシブソナーだった
passhibusonādatta
1. Was passive sonar.
Noun
#162147
1. Was passive sonar.
1. sonar
1. passive
1. passive sonar
1. If/when passive sonar…
1. passive solar
1. active sonar
1. passive matrix display
1. passive house (ultra-low energy building standard)
1. passive smoking