Without expression trees, its impossible to describe expressions in a descriptive format; the only description of them is IL, which is too low level to re-create the user's intent for the expression.

没有表达式树的话，我们是不可能用描述格式来表示一个表达式的。他们唯一的表示方式是IL(中间语言)，这种语言对于重新表述用户的意图来说太低层次了。

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However, the expression level is usually low.

但是，表达水平常较低。

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The detection limitation of PKS using antibodies was 1000 fold higher than Commassie blue staining, ready for detection of the probably very low level of PKS expression in plant.

利用抗体检测pks的检出极限比考马斯亮蓝染色高1000倍，应可用于检测植物中低水平的PKS表达。

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As an American creation, the internet embodies decentralisation and openness on a technical level that has translated into free expression and low-cost access in both political and economic spheres.

ECONOMIST: No one controls the internet, but many are determined to try