可空的

Other than the difference with default values for optional arguments, you should assign a default when a passed argument has a null value.

和PHP不同的是可选参数，你需要比较它是否是空的，再赋给它一个默认值。

They set out on their way, but when they arrived, the pot of fat certainly was still in its place, but it was empty.

他们动身去教堂，可他们到达那里后，看到猪油罐倒是还在那里，里面却是空的。

The scull implementation has no cleanup work to do, so its stop method is empty.

因为 scull 没有清除工作可做，所以它的 stop 函数是空的。

Based on the obtained data and evidence, this research project draws the following conclusions: Chinese L2 learners of English are sensitive to Subjacency and the ECP, thus sensitive to UG; Chinese L2 learners'sensitivities to different constraints are different; Chinese L2 learners tend to reject a lower rate of the sentences with both Subjacency and the ECP violations than those with only Subjacency violation; and there is no significant difference in L2 learners'sensitivity to UG as far as the learners'starting age of learning a L2 is concerned.

通过对调查所得数据的统计和分析，研究者发现：中国人习得英语时对普遍语法是可及的，他们对疑问词移动的不同限制的可及程度不尽相同。研究者还发现，母语为汉语的英语习得者，判断只违反界限原则的句子和判断既违反界限原则又违反空语类原则的句子语法是否正确时，对只违反界限原则的句子判断的正确率更高些。关于开始习得二语的年龄与普遍语法的关系问题，研究者并没有发现两者之间存在着必然的联系。

In other words, the output ultra-short pulse train has a tunable duty cycle.

换句话说，输出的超短光脉冲序列具有可调节的占空比。

Sun Wukong's life can be devided into three stage: sanfueing the dragon king's palace. sanfueing the welkin, and escorting Tang Seng to seek Buddhist scripture.

孙悟空的生命历程可分三个阶段：闹龙宫地府－大闹天宫－护卫唐僧西天取经。

IND_COL as the column is nullable as we may miss some rows.

IND_COL 上的索引，因为可空列的索引会使我们丢掉一些记录。

Based on our previous work, we distinguish emptiable siphons in a plant Petri net model by elementary and dependent ones.

根据我们以前的工作，将Petri网中可被清空的信标分为基本信标和从属信标。

Big Rock Candy Mountain 】◎One evening as the sun went down And the jungle fire was burning Down the track came a hobo hikin' And he said, boys, I'm not turning I'm headed for a land that's far away Beside the crystal fountains ◎So come with me, we'll go and see the big rock candy mountains In the big rock candy mountains There's a land that's fair and bright Where the handouts grow on bushes And you sleep out every night Where the boxcars all are empty And the sun shines every day On the birds and the bees and the cigarette trees The lemonade springs where the bluebird sings In the big rock candy mountains ◎In the big rock candy mountains All the cops have wooden legs And the bulldogs all have rubber teeth And the hens lay soft-boiled eggs The farmers' trees are full of fruit And the barns are full of hay Oh, I'm bound to go where there ain't no snow Where the rain don't fall,the wind don't blow In the big rock candy mountains ◎In the big rock candy mountains You never change your socks And the little streams of alcohol Come a-trickling down the rocks The brakemen have to tip their hats And the railroad bulls are blind There's a lake of stew and of whiskey, too You can paddle all around 'em in a big canoe In the big rock candy mountains...

在那天傍晚日落的时候如同野火在林中蔓延沿着那小路走来一位旅行者他说，男孩们，我决不会回头我一定要到那远方的国度或许就在水晶泉的旁边所以跟我远走高飞吧，我们终将到达那巨石糖果山在巨石糖果山里有个公正明亮的国度灌木从中生长着必需品你可日日在外露宿在那里箱车都是空的每一天都那么晴朗鸟儿和蜜蜂在烟草树周围徘徊蓝鸟在柠檬水的喷泉中放歌在在巨石糖果山里在巨石糖果山里警察的腿都是木桩子公狗的牙都是橡胶的母鸡们生的是荷包蛋果农的树上果实遍布干草也会堆满了马厩 Oh，我一定要去那个没有冰雪的地方雨水不会冲击，狂风不会怒吼在巨石糖果山里在巨石糖果山里你可以不换袜子还有淌着酒的河流如果从岩石上滑下来修补匠们就的去补他们的帽子会有挡在铁轨上的瞎公牛威士忌和炖肉的小湖你可以把它们都搬到船上在巨石糖果山里在巨石糖果山里监狱是用罐头围成即使你被关进去也可以马上再出来这里没有短柄铲子没有斧子，锯子或是镐你我可终日呼呼大睡蠢人才会去工作在巨石糖果山里我将看到你们全都会堕落在巨石糖果山里

The optional cabin of course meets the requirements from the authorities with FOPS approved roof and noise levels.

当然，可选的客舱当局会面与落物保护装置的要求，博莱特空压机通过屋顶和噪音水平。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。