She had sent out well over four hundred invitations that afternoon.那天下午她发出了远远不止 400 份请柬。I used to refuse invitations to parties because I knew I'd go crimson every time someone talked to me.我过去总是拒绝聚会邀请，因为我知道每当有人和我说话...
线粒体的退化是花粉败育中最早发生的现象之一.The degeneration of mitochondria is one of the earliest events in pollen abortion.最后受精的基生胚珠经常败育.Frequently the basal ovule, which is the last one to be fertilized would abort.同时该不育系小花败育日渐严重,制种产量极低, ...
Because of their simplicity, bipolar lead systems were the first to be used in clinical electrocardiography.因为它们简单, 双极导联最先用于临床心电图学.Objective To study electrocardiography diagnosis of ischemia in patients with ventricular...