touch-and-go /ˌtʌʧən(d)ˈgo/
(a.)一觸即發的
touch-and-go
adj : fraught with danger; "dangerous waters"; "a parlous journey
on stormy seas"; "a perilous voyage across the Atlantic
in a small boat"; "the precarious life of an undersea
diver"; "dangerous surgery followed by a touch-and-go
recovery" [syn: parlous, perilous, precarious]