Bed material samplers, as first developed , may be divided into three types.最初的河床质取样器有三种类型.In this paper the performance of two kinds of samplers sintered metal filter is evaluated.本文介绍温、湿度变化对两种改进型被动式活性炭累积氡采样器吸附性能的影响....
特迪咂了咂舌头，活像个不以为然的英国女舍监。Teddy clucked his tongue like a disapproving English matron.他伸出舌头，鼻翼扇动着。He stuck out his tongue and flared his nostrils.我走到镜子前面伸出舌头。I walked over to the mirror and stuck my tongue out....