重點講解:
1. send out 發出(信號、聲音、光、熱等);
例句:Much as bats do, robots send out ultrasonic signals.
機器人就像蝙蝠那樣地發出超聲波訊號 。
2. rule out 排除;不予考慮;
例句:She did not rule out a return to the company in the future.
她沒有排除將來回到公司的可能性 。
3. build up (使)積聚;(使)逐漸增加;
例句:Carbon dust and oil build up in large motors and cause them to short-circuit.
碳塵和燃油在大發動機里越積越多,造成了發動機短路 。
4. at play 起作用;
例句:But there are also psychological factors at play.
但也有心理因素在起作用 。
adj. 毗連的,鄰近的,接近的