The Double Bubble sports a wide, downward-sloping nose which airflow pushes up, so its tail wings can be much smaller.
“双泡沫”机头部宽大、向下倾斜，导致气流上升获得升力，所以它的尾翼可以更小。
2
Then the — so the term structure was downward-sloping until about two and a half years and then it was upward sloping.
期限结构线先向下倾斜，在到期期限过了两年半的时点后，才缓慢回升。
3
The thesis constructs an employment decision model based on a downward-sloping labor supply curve, and parses a type employment called by the author as "expenditure-constraint-causing unemployment".