The timbers groan and creak and the floorboards shift.这些木头在吱吱嘎嘎作响，木地板有些摇晃。Bookshelves groan under the burden of books on threats to the environment.书架上摆满了有关环境威胁的书，不堪重负。The platforms groan with homeward-bound commuters.月台...
然而近代电子学对调谐的频率范围很宽的带通放大器提出很多要求.There is a great deal of demand in modern electronics, however, for bandpass amplifiers.频率是可以调谐的.It is accompanied by a tone.外腔反馈的激光二极管阵列 ( LDA ) 可获得窄线宽 、 可调谐的光谱输出.Linewidth - narrowed, tuna...
'Red? Ooh how nice.'“红色？嗬，真不错。”"Red? Ooh how nice."“红色？嗬，真不错。”"Ooh dear me, that's a bit of a racist comment isn't it."“嗬，天哪！那评论有点种族歧视，不是吗？”‘She’s just about to marry for the fifth time.’ ‘Ooh, she is...