keep a straight face

v.

板着脸；脸不改色；面不改色；

Keep a Straight Face
Neurons that keep a straight face
Neurons that keep a straight face [Neuroscience]
"It helps to have experience of poker when sitting in networking meetings so that you can keep a straight face"
When Greg Dyke Attacked American Television's Cheerleading Coverage of Iraq, How Did He Manage to Keep a Straight Face? the BBC Gave...
Can't Keep a Straight Face
Culture Cinema: Fresh Mayhem Set to Break out on Friday Nights; Ellie Genower Tries to Keep a Straight Face as She Gets the Lowdown ...
Mad Dog unleashed; They talk of peace (and even keep a straight face) as Johnny struts home.
It Was Hard for Us to Keep a Straight Face during the Haka Stand-Off, but We Weren't Budging until They Did - Gethin; Wales V Newzea...
Laporte does well to keep a straight face