该国的经济困境阻碍了其科研机构的工作进展。The country's economic plight is strangling its scientific institutions.内战阻碍着救援机构对饥荒赈济物资的配给。The civil war is obstructing distribution of famine relief by aid agencies.他承诺要让司法正义不受阻碍地得到伸张。He promi...
By 1973, this gap had narrowed almost to vanishing point.到1973年，这一差距已缩小到几乎为零。Many of the ranchers themselves see all this tourism as a cheeky attempt to commercialise a real and vanishing culture.在很多农场主看来，这种旅游完全是一种厚颜无耻的行...
The heptane compound has a primary purpose as a plasticizer for doublebase propellant systems.化合物庚烷的主要用途是作为双基推进剂的增塑剂.However, it is difficult to produce multi branched i heptane and restrain its cracking.正庚烷异构化的难点在于高选择性地...