1.
Frontal thunderstorm over the field， up and down drafts up to40 knots.
锋面雷雨过境，上升下降气流达40海里每秒。
2.
strong turbulence in an otherwise cloudless region that subjects aircraft to violent updrafts or downdrafts.
其他无云地区的强烈的湍流导致飞行器屈从于强烈的上升气流或下降气流。
3.
Methodology of avoiding condensation and downdraft in displacement ventilation plus cooling ceiling system
置换通风加冷却顶板系统避免结露和下降气流的方法
4.
a local region of low pressure or descending air that causes a plane to lose height suddenly.
使飞机突然下降的向下气流或局部低气压地区。
5.
(meteorology) of an air current or wind; moving downward or down a slope because of cooling especially at night.
（气象学）指气流或者风；特别是在晚上因为降温而下降或者沿斜面下降。
6.
The weather forecast says there'll be a cold spell tomorrow, windy, and the temperature will fall to7 below zero at the highest.
天气预报说明天有寒流，刮风，气温会降到最高气温为零下7度。
7.
Characteristic of Heat and Mass Transfer of Falling Film Under Moist Air Sweeping Condition
湿空气吹扫条件下降膜流动传热传质特性
8.
An Experimental Study on the Liquid Hold-up of Gas-Liquid Biphasic Tilted Descending Pipelines
气液两相流倾斜下降管持液率实验研究
9.
Lower inlet style means the dusty flow inlet is situated on the lower part of the bag-house,and the direction of flow is opposite to that of dust precipitastion.
下进风是指含尘气体流入口位于袋室下部，气流与粉尘沉降方向相反。
10.
The temperature is going down; The barometer is falling; Real estate prices are coming down.
温度正在下降；气压下降了；房地产价格正在下降。
11.
updraft and downdraft
上曳气流和下曳气流
12.
Temperature decreases with elevation through the troposphere at a rate, normally, of about0.6℃ for100 m.
在对流层，气温随高度减小，其递减率通常为每上升100米下降0.6℃右。
13.
Welding quality will also decline if there is strong air movement around the working ambience.
如果焊接环境有较强的空气流动，也可能造成焊接质量下降。
14.
RELATIONSHIP BETWEEN THE JUNE-JULY PRECIPITATION ANOMALIES IN MID-LOWER YANGTZE RIVER AND 500 HPA ATMOSPHERIC CIRCULATION
长江中下游6—7月降水异常与500 hPa大气环流的关系
15.
A parameterization scheme for regional mean runoff over heterogeneous land surface under climatic rainfall forcing
降水气候强迫下非均匀地表区域平均径流的一种参数化方案
16.
The temperature drops in September.
气温在九月间下降。
17.
The temperature has been descended seven degrees at one night.
气温一夜间下降了七度。
18.
The temperature falls to - 30 degrees .
气温降至零下３０度。