shizen saimu
1. natural obligation
Noun
#301047
1. natural obligation
1. nature; the natural world
1. nature; Mother Nature
1. natural environment; (the) environment
1. nature park; natural park
1. unnatural; artificial
1. debt; liabilities
1. nature
2. natural; spontaneous
3. naturally; spontaneously
1. natural science
1. Natural; Nature's