it must still be there.it must be still there.哪一个对?still 的用法是什么样的?它用在句中的位置是什么样的?与情态动词、be动词、 实意动词?

still
n.
寂静,剧照,照片
adj.
静止的,静寂的
adv.
还,仍,更,还要,尽管如此,依然
静止画面,静态图片
现代英汉综合大辞典
still
n.
蒸馏器[室],蒸馏锅
酿酒场
【词性变化】
still
vt.,vi.
[古]烧(酒),蒸馏
【继承用法】
stillroom
n.
[英]蒸馏室,酒库[窑]
【特殊用法】
accumulator still
缓冲罐[釜]
alternating stills
轮换操作分馏塔
ammonia still
氨气塔; 蒸氨塔
atmospheric still
常压管式加热炉
batch still
间歇蒸馏釜[罐]
batch coke still
分批焦化蒸馏器,间歇式焦化蒸馏器
beer still
蒸馏釜,蒸馏锅
bromine still
蒸溴器
centrifugal molecular still
离心分子蒸馏器
chlorine still
氯气发生器
column still
塔式蒸馏器,蒸馏柱[塔]
continuous battery still
连续蒸馏锅组
cracked still
裂化炉
crude still
原油蒸馏釜
distillating still
蒸馏釜
down-convection pipe still
烟道气向下流动的管式炉
equilibrium still
平衡蒸馏锅
equilibrium flash still
平衡闪蒸锅
falling-film still
降膜式蒸馏器
falling-film molecular still
降膜分子蒸馏釜
glycerin still
蒸甘油锅
hog still
蒸馏塔
iodine still
蒸碘器
iron still
铁制蒸馏锅
jacketed still
套层蒸馏器
lime still
石灰蒸氨器
lime lee still
石灰拘酸蒸馏器
liming still
(制)石灰乳槽
low-wines still
低度葡萄酒蒸馏器
lubricating oil still
润滑油釜
molecular still
分子蒸馏器(高真空蒸馏器)
mud still
泥浆沉降器
nitric acid still
硝酸蒸馏器
once-through pipe still
一次蒸发管式炉; 常压管式炉
oxidized still
氧化炉
platinum still
白金蒸馏釜
pot still
罐(式蒸)馏器
pressurized still
受压蒸馏釜
radiant-type pipe still
辐射型管式炉
reaction still
反应锅[釜]; 反应塔
recirculation still
循环炉; (裂化装置中)循环气体的炉子
rectifying still
精馏釜
reducing still
轻质油蒸馏釜
rerunning still
再蒸馏锅
shale tar still
页岩焦油蒸馏釜
shell still
蒸馏釜
side-fired recirculating still
侧热循环釜; 炉侧加热与气体循环管式炉
simple batch still
单程蒸馏釜
small-duty pipe still
小生产率管式炉; 小能量管式炉
solar still
太阳能蒸发器
steam-bottom still
底部蒸汽加热蒸馏釜
stirred-pot still
带搅拌器的蒸馏器
stripping still
汽提蒸馏器
sulfur still
硫化釜
tar dehydrating still
焦油脱水蒸馏釜
topping still
拔顶塔; 粗馏塔
topping pipe still
拔顶管馏器
tower still
塔式蒸馏器
vacuum beer still
真空醪塔
vacuum extraction still
真空抽提器
wash oil still
洗油蒸馏釜
现代英汉词典
still 1
adj.
不动的；停滞的； 无风的
The sea was calm and still.
大海风平浪静.
Keep still while I comb your hair.
我给你梳头时,请不要动.
寂静 的；沉寂的
不含气体的（饮料）
still 2
n.
蒸馏器
【词性变化】
still
n.
平静,安静
in the still of night
在寂静的夜晚
电影剧照
still
adv.
仍,仍然,还
He came yesterday and he is still here.
他昨天来的,现仍在此.
My father still remembers his first day at school.
我的父亲仍记得他上学的第一天.
Today the best jobs are still given to men.
现在最好的工作还是给予男人.
（尽管如此）仍然,依旧
更；愈
That would be better still.
那就更好了.
still
vt.
使安静,使平静
to still a crying child
使啼哭的小孩安静
使静止；使平息