adj.在试验管中作成的,人工授精产生的;
例句:
He held the test tube in his hand thoughtfully.
他沉思地把试管拿在手里.
By using side of the test tube, the crow bend the wire.
乌鸦利用瓶口将铁丝顶端弯成钩状.
He never held a test tube in his hand.
他手里从没拿过试管.