A new book on the Titanic has suggested that the doomed liner did not send out a distress signal for three quarters of an hour after it hit the iceberg which ruptured its hull.
一本关于泰坦尼克号的新书说这艘毁灭的班轮在撞上毁坏船体沉没前的45分钟内冰山没有发出求救信号。
When damaged heart tissue sends out an 'SOS' distress signal, this subset of bone marrow cells mobilizes quickly and stimulates the growth of new blood vessels in the heart.
当受损的心脏组织发出“SOS”求救信号时，这个骨髓细胞的亚群迅速动员起来，激发心脏里新的血管的生长。
When damaged heart tissue sends out an 'SOS' distress signal, this subset of bone marrow cells mobilizes quickly and stimulates the growth of new blood vessels in the heart.
当受损的心脏组织发出“SOS”求救信号时，这个骨髓细胞的亚群迅速动员起来，激发心脏里新的血管的生长。
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