1. To ensure safety, the train is controlled by an advanced computer system. ensure用作动词，意思是\"确保;担保\"，常用于以下句型： ①ensure that... 保证...... I tried to ensure that everybody understood the instructions. 我设法确保每个人都明白这个说明。 I can\'t ensure that he will arrive there in time. 我不能保证他及时赶到那儿。 ②ensure sb. sth. 确保某人某事/物 This medicine will ensure you a good sleep. 这药会确保你睡个好觉。 2. It will not be business as usual in the future. as usual 意思是\"像往常一样;一如往常\"。 As usual, there weren\'t many people at the meeting. 像往常一样，来开会的人不多。 Yesterday morning she came into the classroom as usual. 昨天早上她像往常一样进入教室。 usually为副词，也有\"通常;往常\"的意思，常放在be后、情态动词或助动词与动词之间，为加强语气也可置于句首。 You don\'t usually arrive late, do you? 你通常不迟到的，是吗? Usually she gets up very early. 通常她起得很早。 3. They are careful about what they eat and exercise regularly. be careful意思是\"注意;当心\"，常用于以下句型： ①be careful to do sth. Be careful not to be late for class. 小心上课不要晚了。 ②be careful (that)... Be careful that you are not late for class. 注意上课不要迟到。 ③be careful about / of (=take care of) Be careful of your health. 注意你的身体。 ④be careful (in) doing sth. Be careful (in) crossing the road. 过马路时要小心。 ⑤be careful with sth. Be careful with your work. 工作要认真。 4. Advances in medical science have also allowed us to deal with new diseases, such as SARS. deal在句中可用作及物动词或不及物动词： ①用作不及物动词，常与with连用，意思是\"对付;处理\"。 He seemed to be quick-tempered, but was actually not difficult to deal with. 他似乎性子急躁，但实际上并不难相处。 He knows how to deal with children. 他知道怎样对付孩子。 ②用作及物动词，意思是\"分配;给予\"等。 I tried to deal justice to all men. 我力求公正地对待所有的人。
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