在我们开始之前，因为我们需要的是导数，取方程两边的导数。
Before we do that, since what we're after is the derivative, let's take the derivative of both sides.
记住，当写的是近似值时，两边并不完全相等，但如果取很小的变化时，那么，最终两边的值将越来越接近。
Remember when we write approximately equal that means it is not quite the same, but if we take smaller variations then actually we will end up with values that are closer and closer.
该模型认为，当主干与侧枝的截面积之间存在类似平行四边形法则的关系时，分枝的体积取极小值。
This model suggests that, when the relation "parallelogram rule" exists between main stem and sub branches, the total volume of branches is minimal.
线性键控保持键的柔边，并且通常增益值取1或一致。
Linear keying preserves soft key edges, and generally has a gain of 1, or unity.
通过大范围自然冲沟、人工取土场、道路开挖边坡和路堑的野外观察，新发现临潼-长安断裂露头40余处。
By the field survey to the natural gullies, the earth fetching areas, and the excavated slope and chasm for road foundation, we discovered 40 outcrops of the Lintong-Chang'an Fault.
取不粘锅倒油加热，鱼肉堡的每一面都煎上4到5分钟，直到表面边松脆而且鱼肉变熟。
Heat the oil in a non-stick frying pan, then fry the burgers for 4-5 mins on each side, turning until crisp and cooked through.
将左右两边取中间部分捏紧，将其余的边边捏紧。
To the right of the middle part to the middle pinched, the remaining two edge pinched.
但是取定值的方法不能考虑边坡工程地质条件和岩土体参数的不确定性。
However the certain method can not take into account uncertainties of geologic conditions and geomechanics parameters in site.
歌边拚取，醉魂和梦，化作梅边瘦。
Take sides fight song, drunk soul and dreams, into plum edge thin.
将左右两边取中间部分捏紧，将其余的边边捏紧。
To get pinched in the middle of left and right sides only, will the rest of the edge pinched.
取料场采挖边坡的土壤加速侵蚀系数为76，采挖台面的土壤加速侵蚀系数为64；
For the borrow pit, the acceleration erosion coefficient of cutting slope and table-board is respectively 76 and 64.
取一只中碗，放入鸡肉，芹菜，西红柿，翠玉瓜，葡萄干，欧芹和薄荷，搅拌，放置一边备用。
In a medium bowl, combine chicken, celery, tomatoes, zucchini, raisins, parsley, and mint, and set aside.
取一只中碗，放入鸡肉，芹菜，西红柿，翠玉瓜，葡萄干，欧芹和薄荷，搅拌，放置一边备用。
In a medium bowl, combine chicken, celery, tomatoes, zucchini, raisins, parsley, and mint, and set aside.
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